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Kan Nakazono (the University of Tokyo)Student/ECR Presentation
Quantum devices based on Josephson junctions have attracted growing interest for ultra-light dark matter detection. In particular, superconducting qubits can be used as sensitive detectors [1, 2, 3, 4] or frequency tuners [5, 6, 7] in haloscope-like measurements for dark photon and axion searches.
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A direct excitation scheme using superconducting qubits [3] can combine high tunability,... -
Dora Maiello (Università di Padova, INFN Padova)Invited Presentation
Cavity-based searches for wave-like dark matter require microwave resonators combining high quality factors to enhance sensitivity with wide frequency tunability to probe the largest possible range of candidate particle masses. This is particularly important at high frequencies, where the parameter space is largely unexplored due to the poor scaling of the expected signal with the cavity...
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Paige Taylor (Swinburne University of Technology)Student/ECR Presentation
The ORGAN experiment seeks to detect axion dark matter through its resonant conversion to microwave photons inside a strong magnetic field. With the ORGAN 1b run complete, attention turns to ORGAN 2a, which will probe the previously unexplored 15.96–16.15 GHz band, corresponding to axion masses of 66.0–66.8 μeV. Here we describe the design, optimisation, and performance of the rectangular...
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Kosuke Nakamura (Kyoto University)Student/ECR Presentation
We propose a novel high frequency gravitational wave search using superconducting coplanar waveguide resonators, targeting the kHz-MHz band motivated by several theoretical predictions such as primordial gravitational waves and gravitational waves produced by the superradiance of coherent bosonic fields around black holes.
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The signature is periodic shifts in the resonator frequency caused by... -
Koki Aoyanagi (Kyoto University)Student/ECR Presentation
Qubit-based readout technologies enable a SQL-free sensitivity in dark matter haloscope experiments, particularly in the high frequency regime (>5GHz). We are developing high frequency superconducting qubit detectors for direct excitation dark-photon searches above 20 GHz, where suitable devices have not yet been established. Toward this goal, we introduced a “double-oblique evaporation”...
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Thomas BrainePoster Presentation
Axions are a well-motivated wave-like dark matter candidate that additionally solves the strong CP problem, detectable via cavity haloscopes. However, haloscope sensitivity degrades significantly at higher axion masses due to decreasing cavity volume, increasing thermal noise, and degradation of cavity quality factor. The ADMX collaboration is actively developing and deploying novel...
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Sephora Ruppert (Stanford University)Oral Presentation
The Axion Dark Matter eXperiment (ADMX) is a major haloscope experiment that has achieved DFSZ sensitivity at around 1 GHz. VERA (“Volume Enhanced Resonators for Axions”) is an ADMX high-frequency working group that explores new geometries for resonators with volumes far exceeding $\lambda^3$ ($V\gg \lambda^3$). The main objective is to extend ADMX's sensitivity to theoretically motivated...
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Jesse Schelfhout (University of Oxford)Student/ECR Presentation
Atom interferometers are highly-versatile quantum sensors with applications ranging from geodesy and inertial navigation to fundamental physics studies. Differential measurements between two or more atom interferometers operated using a common laser beam offer the prospect for mid-frequency gravitational wave detection and a wide range of ultralight dark matter studies [1]. The sensitivity of...
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Cedric Quint (Max Planck Institute for Nuclear Physics)Student/ECR Presentation
We study axion-like particle (ALP) production via proton bremsstrahlung in proton beam dumps. Using the Weizsäcker-Williams approximation and the ALPINIST framework, we compute ALP production rates and derive constraints on the product of ALP-electron and ALP-proton couplings, $g_eg_p$, via the decay channel $a \rightarrow e^+ e^-$. We further assess the sensitivity of our results to the...
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Junu Jeong (Stockholm University)Invited Presentation
Plasma haloscopes offer a compelling methodology for probing higher-mass axions, particularly above 10 GHz---a parameter space strongly favored by recent post-inflationary cosmological simulations. Utilizing wire metamaterial resonators, the ALPHA collaboration is preparing for its Phase 1 run, with the first scientific run anticipated in early 2028, to target the 10 to 20 GHz frequency range....
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Laura Roberts (Max Planck Institute for Gravitational Physics (Albert Einstein Institute))Poster Presentation
In the ALPS Optics group at DESY, we are developing new interferometric techniques to test fundamental physics using optical cavities. One such effect is vacuum magnetic birefringence (VMB). VMB is a consequence of QED where under the influence of a magnetic field, the vacuum behaves as a non-linear optical medium. A VMB search also serves as an important tool in the hunt for beyond the...
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Angelo Esposito (Sapienza University of Rome & INFN)Oral Presentation
I will discuss a novel broadband strategy to search for axions by leveraging observables controlled by the axion field squared. A practical implementation of this concept, allowing to probe the axion–photon coupling, is to operate a dc SQUID at the flux sweet spot. There, the output voltage depends quadratically on the magnetic flux. Using lock-in modulation one can also evade low-frequency...
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Soham Ghatak (Indian Institute of Science Education and Research Bhopal)Student/ECR Presentation
My work investigates the Casimir energy and its associated macroscopic mechanical torque between two microscopic parallel plates immersed in a spatially varying axionic background. Extending foundational models in axion electrodynamics, we evaluate the effective action of the photon and ghost sectors by calculating the eigenvalues of the inverse propagator and performing rigorous vacuum energy...
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Gray RybkaOral Presentation
QCD axions are expected to both mediate forces between nuclei and interact electromagnetically. Axion dark matter haloscope searches have exquisite sensitivity, but only to narrow bands of axion masses and rely on axions making up a known quantity of dark matter. 5th force experiments do not rely on dark matter and have a wide axion mass range, but are limited in coupling sensitivity. Is...
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Dr Noah Bray-Ali (Science Synergy)Poster Presentation
A basic design principle of axion dark matter microwave cavity experiments, such as ORGAN, HAYSTACK, and ADMX, is the haloscopic scaling with the square root of the cavity for the sized of the oscillating electric field at the axion Compton frequency created by axion-to-photon conversion in the static magnetic field within the cavity. Yet, wave-like dark matter magneto-optical experiments,...
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Mr Mohammad Aghaie (University of Pisa)Student/ECR Presentation
We propose simple scenarios where the observed dark matter abundance arises from decays and scatterings of heavy quarks through freeze-in of an axion-like particle with mass in the 10 keV − 1 MeV range. These models can be tested by future X-ray telescopes, and in some cases will be almost entirely probed by searches for two-body decays K → π + invis. at NA62. As a byproduct, we discuss the...
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Ananthu Krishnan Anilkumar (University of Sydney)Student/ECR Presentation
If dark matter is axions that solve the strong CP problem and the symmetry breaking of the axion field happens after inflation, there exists the possibility that the axions are clumped into asteroid sized objects called miniclusters. But these objects formed in the early universe is likely disrupted by the tidal forces and stellar interaction at late times, causing the local dark matter...
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Paola Arias (Universidad Federico Santa María)Oral Presentation
We study the growth of axion perturbations during a period of early matter domination. Our findings show that the coupling of the time-varying axion mass with the radiation bath leads to a significant enhancement of the perturbation, reaching non-linearity even before reheating ends in some parameter space. We comment on the possibility of forming axion miniclusters in the pre-inflationary...
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qazal rokn (Max Planck Institute for Gravitational Physics)Poster Presentation
Axionlike particles are compelling ultralight dark matter candidates that may couple weakly to photons and induce minute, time varying rotations of the polarization state of light. Cavity enhanced polarimetry offers a promising route to probing such effects by amplifying small polarization changes over many optical round trips. In particular, a Fabry Perot cavity containing two intracavity...
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Dr Jongkuk Kim (Kangwon National University)Poster Presentation
In 2023, the Belle II Collaboration announced the observation of the
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B→K+νν decay channel for the first time. This decay channel provides a clean signal with high precision in theoretical calculations. However, we encounter a 2.8σ deviation from the Standard Model prediction. To resolve this excess, we study a scalar dark matter model with local discrete Z_3 symmetry. Assuming dark... -
Daniel Gavilan-MartinInvited Presentation
Hypothetical light scalar particles trigger the superradiant instability around spinning black holes (BHs), causing clouds of scalars to grow around the BH. In the presence of sufficiently strong particle self-interactions (characterized by the decay constant $f$), scalars are ejected from BH orbits, resulting in coherent, non-relativistic emissions that continuously carry away the BH's...
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Aleksandr Pustyntsev (Johannes Gutenberg University of Mainz)Invited Presentation
Low-energy precision experiments provide unique sensitivity to feebly coupled light states that are inaccessible at high-energy colliders. In this talk, we present projected sensitivities for light Beyond the Standard Model (BSM) mediators with masses below 100 MeV at two such facilities. First, we explore the MAGIX experiment at MESA, utilizing high-intensity electron beams on a heavy...
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Prof. Nicole Bell (The University of Melbourne)Oral Presentation
The capture of dark matter in stars provides a cosmic laboratory in which to study the nature of dark matter particles and their interactions under extreme conditions. We discuss the capture of dark matter in neutron stars and white dwarfs, and the heating caused by the subsequent thermalisation and annihilation of that dark matter. We find that most of the dark matter’s kinetic energy is...
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Madeleine Carhart (University of Washington)Student/ECR Presentation
DPHaSE (Dielectric Powder Haloscope SNSPD Experiment) is a broadband axion and dark photon search targeting QCD axion-photon couplings in the 10 meV-eV mass range. The haloscope makes use of dark matter to photon conversion on the surface of disordered dielectric powder, with conversion rate proportional to surface area. To achieve sensitivity in this mass range, our dielectric haloscope...
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Dionysios Antypas (University of Crete)Oral Presentation
Axionlike dark matter may generate an oscillating pseudomagnetic field
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through its gradient coupling to fermion spins. We report on the results
of a recent search [1] for this interaction using a
radio-frequency $^{87}\mathrm{Rb}$ atomic magnetometer, whose Larmor
frequency is scanned to provide broadband sensitivity. The measurement
probes axionlike-particle (ALP) masses... -
Giacomo D'AmicoInvited Presentation
Axion-like particles (ALPs) are well-motivated extensions of the Standard Model that can induce photon–ALP oscillations in the presence of external magnetic fields. For very-high-energy (VHE) gamma rays, these oscillations may leave observable signatures in the spectra of astrophysical sources, such as energy-dependent flux fluctuations or spectral hardening at TeV energies.
We present a...
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Prof. Marcin Badziak (University of Warsaw)Oral Presentation
Axions can be produced thermally in the Early Universe leaving imprints in cosmological observables. I will discuss recent developments in the computation of the abundance of thermally produced axions and present improved cosmological constraints on axion interactions. Cosmology provides the strongest constraints to date on several axion couplings. Based on 2410.18186 and 2511.14864 and some...
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Shunsuke Adachi (Okayama University)Poster Presentation
Our project, DOSUE-RR (Dark-photon dark-matter Observing System for Un-Explored Radio-Range), is one of the experiments searching for dark matter using a dish antenna method. We particularly target the relatively high mass range above 100 $\mu$eV, covering the full millimeter-wave band from roughly 20 GHz to 300 GHz, which corresponds to a mass range of approximately 80 $\mu$eV to 1.2 meV....
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Daniel AvrahamStudent/ECR Presentation
The CYGNUS-OZ collaboration is pursuing the development of gaseous Time Projection Chambers (TPCs) for next-generation rare-event particle physics experiments that make use of the directional measurements achievable with these detectors. Directional detectors offer a powerful handle for distinguishing a genuine signals of interest from backgrounds. The quintessential use-case of directional...
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Abaz Kryemadhi (Messiah University)Invited Presentation
The Dark-photons & Axion-Like particles Interferometer (DALI) is a novel haloscope concept designed to search for axions and dark photons above 25 μeV using a large area magnetized phased array and a tunable Fabry–Pérot resonator. A proof-of-principle demonstrator operated at the Instituto de Astrofísica de Canarias has successfully validated the core DALI technologies and produced the first...
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Dr Patrick Fitzpatrick (Department of Physics & Astronomy, University of New Hampshire)Oral Presentation
The apparent fine-tunings of the Standard Model Higgs potential may be a consequence of its near-criticality. If its parameters are selected by an underlying mechanism that places the theory near criticality, then the scale of vacuum instability sets an upper bound on the Higgs mass. This reframes the hierarchy problem as a consequence of vacuum metastability and predicts new physics that...
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Efe YenicePoster Presentation
We present a detailed analysis of the dark matter distribution and disk
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stability of the dwarf irregular galaxy NGC 3741 using multi-wavelength
observations. HI, optical, and near-ultraviolet (NUV) imaging data were
retrieved from the SkyView Virtual Observatory, providing a comprehen
sive view of both the gaseous and stellar components.
Using the HI surface density and rotation curve... -
Dr Leanne Duffy (Los Alamos National Laboratory)Oral Presentation
Optical Quantum Sensors (OQS) are extremely sensitive ambient-temperature magnetometers which can be applied in axion dark matter searches using an inductor-capacitor (LC) circuit. At Los Alamos National Laboratory, we recently proposed to develop a sensitive search for ultralight axion dark matter by pushing OQS sensitivity to a world first level of 60 aT/Hz$^{1/2}$. Combining this OQS with a...
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Chikara Kawai (The University of Tokyo)Poster Presentation
Axions are well-motivated dark matter candidates that can be converted into extremely weak microwave photons in a strong magnetic field. At frequencies above a few gigahertz, axion searches relying on phase-preserving linear amplification are increasingly limited by the standard quantum limit, motivating the development of photon-counting receivers. Transmon-based single microwave photon...
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Elizabeth LeasonOral Presentation
Superfluid helium-3 bolometers can exploit the extremely low superfluid gap (10e-7 eV) to give ultra-low energy threshold dark matter direct detection searches. This gives the potential to probe dark matter models with sub-GeV/c2 masses, in particular offering world-leading sensitivity to spin-dependent interactions. Realising this requires operation at ultra-low temperatures in the 100s uK...
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Dr Irene Bolognino (Adelaide University)Poster Presentation
The SABRE South experiment, located at the Stawell Underground Physics Laboratory (SUPL) in Victoria, Australia, is an ultra-low-background dark matter experiment designed to test the long-standing annual modulation signal reported by DAMA/LIBRA. The detector employs ultra-pure NaI(Tl) crystals surrounded by an active liquid scintillator veto instrumented with 32 photomultiplier tubes (PMTs),...
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Dr Sheon Chua (The Australian National University)Oral Presentation
Ultralight vector dark matter is expected to form a coherent oscillating field that can generate tiny, periodic forces detectable by precision instruments. Our differential torsion sensor focuses on detecting differential accelerations between beryllium (Be) and aluminium (Al) test masses, materials chosen for their contrasting neutron-to-mass ratios. By measuring the differential...
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Igor Samsonov (UNSW)Oral Presentation
Dark matter coupled to the Standard Model only through gravity is usually regarded as beyond the reach of laboratory searches. In models with large extra dimensions this expectation can be altered, since the short-distance gravitational potential is enhanced and scales as ($1/r^{1+n}$). I will discuss dark-matter scattering in Arkani-Hamed–Dimopoulos–Dvali scenarios, where exchange of...
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Paolo Salomone (The University of Chicago)Oral Presentation
Weakly Interacting Massive Particles (WIMPs) are considered one of the most promising candidates for dark matter (DM) and could potentially be detected through their interactions with standard model particles.
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The DarkSide program has pioneered the development of two-phase argon time projection chambers (TPCs) for direct DM searches, employing low-radioactivity argon extracted from... -
Shunki Endo (University of Tsukuba)Student/ECR Presentation
The dark photon is one of the candidates for cold dark matter. It is theoretically motivated by specific models of string theory and inflation models, characterized by a very small mass in the range of$m_{\text{DP}} \approx \mu\text{eV} - \text{meV}$. It interacts with ordinary photons through a kinetic mixing parameter $\chi (\le 10^{-10})$. Driven by this interaction, the dark photon...
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Hiroki Takeuchi (Kyoto University)Oral Presentation
We report on a direct search for dark photon dark matter with the DOSUE-RR experiment in the mass range of 80–160 $\mu \rm{eV}/c^2$, corresponding to 19-38 GHz. Dark photon dark matter can convert into ordinary photons at a conducting surface, producing a narrow-band millimeter-wave signal whose frequency is determined by the dark photon mass. The experiment searches for this signal using a...
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Jonathan Charlesworth (UWA)Student/ECR Presentation
We utilise an effective-current framework for electromagnetic dipole generation to recover the axion-induced oscillating electric dipole moment of a static magnetic dipole $\vec{d}_a(t) = -\frac{g_{a\gamma\gamma} a(t)}{c} \vec{m}$. We extend this approach to more general axion-electromagnetic couplings, yielding oscillating electric and magnetic dipole moments $\vec{d}a(t) = g{aEM}a(t)...
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Dan Zhang (University of Washington)Poster Presentation
We estimate the synchrotron radiation emitted by cosmic-ray muons in a uniform magnetic field, focusing on the photon radiation from µeV to meV. Such events can potentially bring backgrounds to the axion dark matter searches. The GEANT4 software package is utilized to simulate the muon tracks in a cylindrical region of interest with an 8 T solenoid magnetic field applied. We further develop an...
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David Herbschleb (QUP, KEK)Oral Presentation
Ultra-low mass axion-like particles are well-motivated dark matter candidates. The wave-like behaviour in the sub-eV mass range is leveraged for searches for this possibility via coupling to fermion spins. In the non-relativistic limit, spins experience this dark matter background as a minuscule pseudo-magnetic field that can be measured exploiting quantum sensing methods. Here, we explore a...
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Yeray Garcia Del CastilloStudent/ECR Presentation
In the pre-inflationary scenario, axion dark matter is expected to be highly homogeneous, with perturbations sourced mainly by gravity. We study a recently proposed mechanism in which the axion field couples to the temperature fluctuations in the primordial plasma, analysing its interplay with gravitational perturbations. We show how these plasma-induced fluctuations are transferred to the...
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Jacob Mathias Egge (DESY)Poster Presentation
In order to access the high-frequency regime motivated by post-inflationary axion scenarios, new haloscope designs are required. A simple yet underexplored geometry is the open Fabry-Pérot resonator, whose volume scales as 1/f rather than the punishing 1/f³ of traditional cavity haloscopes. We present FAxE (Fabry-Pérot Axion Experiment), a haloscope concept using an open Fabry-Pérot resonator...
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Akira Miyazaki (Université Paris-Saclay (FR))Invited Presentation
The QCD axion is a well-motivated hypothetical particle that simultaneously addresses the strong CP problem and constitutes a compelling cold dark matter candidate. The MADMAX experiment (Magnetized Disk and Mirror Axion Experiment) is designed to search for dark matter axions and similar particles (axion-like particles and dark photons) in the mass range of 40–400 μeV by boosting the...
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Elrina Hartman (University of Western Australia)Student/ECR Presentation
We studied the feasibility of implementing cryogenic bolometry for rare-event searches with the temperature-sensitive, high-Q whispering gallery mode in a sample of single-crystal calcium tungstate (CaWO$_4$) and present conservative estimates of the minimum energy threshold on the order of MeV.
Solid-state detectors for rare-event searches typically utilise a crystalline target coupled...
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Akira Miyazaki (Université Paris-Saclay (FR))Poster Presentation
We generalize Glauber’s theorem to quantum fields generated by classical sources, including axion dark matter and gravitational waves. In quantum optics, Glauber’s theorem states that a classical current produces quantized photons in a coherent state. Likewise, the linearity of the inverse Primakoff and Gertsenshtein effects leads to coherent photon states in resonant cavities driven by...
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Bianca GiacconeInvited Presentation
The SQMS Center develops state-of-the-art superconducting and quantum technologies for ultra-sensitive searches for physics beyond the Standard Model. By combining superconducting radio-frequency cavities with quantum devices, SQMS is pursuing a broad experimental program targeting axion and dark photon dark matter, high-frequency gravitational waves, and other weakly interacting particles....
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117. High-Resolution Axion Search with ORGAN-Q and Thin-Film Coupling for Multi-Resonator HaloscopesMr Michael Hatzon (University of Western Australia)Student/ECR Presentation
The ORGAN-Q experiment is a dark matter microwave haloscope operated at millikelvin temperatures, featuring a Josephson parametric amplifier. Two simultaneous data streams were recorded during a search for axion dark matter between 6.15--6.35 GHz (25.45--26.27 $\mu$eV). The standard halo model axion search yielded the leading axion--photon exclusion limits across this interval. We report the...
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Elena Pinetti (Flatiron Institute/Simons Foundation)Plenary Presentation
Dark matter provides compelling evidence for physics beyond the Standard Model, motivating a broad landscape of candidates ranging from weakly interacting massive particles to ultralight axions. Astrophysical observations offer a complementary avenue to laboratory experiments for testing dark matter models across a broad range of masses and interaction strengths.
In this talk, I will...
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Vera Butz (University of Heidelberg)Poster Presentation
We calculate the axion flux from the Sun due to axion-electron interactions by fully accounting for electron transitions between different bound states. For multiple elements, we consider a wide range of ionization and excitation states and compute the axion-induced transitions between them.\
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The axion flux from axion-electron interactions is usually estimated via an approximate relation to... -
Cindy Zhao (Quantum Technologies and Dark Matter Labs, Department of Physics, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.)Student/ECR Presentation
High-quality microwave resonators are a key enabling technology for axion haloscopes and other wave-like dark matter experiments, where detector sensitivity depends critically on the stability and microwave loss of dielectric materials at cryogenic temperatures. Potassium tantalate (KTaO₃) is a promising quantum paraelectric dielectric owing to its high relative permittivity and intrinsically...
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Emma Paterson (University of Western Australia - QDM Labs)Student/ECR Presentation
Ultralight axion dark matter may couple to electromagnetic fields through the interaction term $g_{a\gamma\gamma}a\,\mu_0\mathbf{E}\!\cdot\!\mathbf{H}$ [1-4]. Traditional cavity haloscopes exploit this coupling using a strong external DC magnetic field [5,6], whereas upconversion experiments use the spatial overlap between resonant electromagnetic modes to probe axion frequencies below the...
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Aaron Dean Spector (Deutsches Elektronen-Synchrotron DESY)Oral Presentation
The ALPS group at DESY has constructed a unique infrastructure for tests of fundamental physics consisting of two strings of 12 HERA dipole magnets. Each string provides 5.3 T magnetic fields over a length of roughly 100 m with cleanrooms in between the magnet strings and at the ends of the experiment. This environment is particularly well suited for experiments that use laser interferometry,...
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Sara Diglio (SUBATECH/CNRS/In2p3)Invited Presentation
The XENONnT experiment operates a dual-phase liquid xenon time projection chamber at the INFN Laboratori Nazionali del Gran Sasso, designed primarily to search for weakly interacting massive particles (WIMPs). Thanks to its ultra-low background rate and low energy threshold, XENONnT is also uniquely sensitive to a wide range of rare processes, including coherent elastic neutrino-nucleus...
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Arthur Talarmin (CNRS - Institut Néel)Poster Presentation
Haloscopes are sensitive detectors used for dark matter axion search in the microwave energy range. They rely on the axion to photon conversion in a static magnetic field, and its amplification by resonance with a cavity electromagnetic mode. While simple cylinder cavities working below 1 GHz can provide large volume detectors of typically a hundred liters or more (GrAHal-CAPP), searches at...
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Tobias Schiffer (University of Bonn (DE))Oral Presentation
The non-discovery of WIMPs at the LHC and the negative outcome of direct detection experiments have led to a steadily increasing interest in models with light dark matter. Models with a dark matter candidate that has a mass below the Lee-Weinberg bound can predict the right dark matter relic density if a new gauge interaction is introduced in addition to the dark matter candidate. The new...
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Sonali ParasharStudent/ECR Presentation
The Magnetically Transduced Gravitational-Wave Inertial Detector (MAGI) is a broadband experiment that uses a large static magnetic-field gradient generated within a superconducting magnet. The inertial pickup element operates in the free-mass regime [1], and its motion is measured inductively using a superconducting pickup loop coupled to either a superconducting quantum interference device...
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Mudit JainOral Presentation
Wave dark matter is often described as a classical field, with this description motivated by the large occupation numbers of ultralight bosonic particles. Yet the relation between a highly occupied quantum many-body state and a single classical field is subtle. In this talk, I will discuss what it means for wave dark matter to admit a controlled classical-field description, emphasizing the...
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Sung Woo YOUN (IBS-DMAG)Invited Presentation
The QCD axion is a compelling dark matter candidate motivated by the Peccei–Quinn solution to the strong CP problem. The IBS Dark Matter Axion Group (IBS-DMAG) searches for axion dark matter using cavity haloscopes, where axion–photon conversion is enhanced by strong magnetic fields and high-Q microwave resonators. In this talk, I will present recent IBS-DMAG results, highlighting the...
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Maaz Hayat (University of Melbourne)Poster Presentation
Invisible axion models are well motivated solutions to the strong CP problem, yet they typically contain a largely unconstrained flavour sector. I will present a predictive class of Minimal Flavoured DFSZ models in which the Peccei–Quinn symmetry simultaneously explains the observed pattern of quark masses and mixing while possessing a domain wall number of unity. The flavour structure is...
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Muping ChenPoster Presentation
We propose the use of sphere-and-plate Casimir force measurement setups to detect ultralight vector dark matter. We demonstrate that sub-picometer signals can be parametrically amplified to be detectable. We present a novel improvement that allows the continuous tuning of the natural frequency of the system, opening new research opportunities at the submicron scale. We show that the improved...
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Jackson Mitchell-Bolton (University of Sydney)Student/ECR Presentation
Pulsar polarisation arrays (PPAs) enable searches for oscillations in the polarisation position angle of radio waves induced by axion-like particles. They currently provide some of the strongest constraints on ultralight axion-like dark matter (ALDM) of mass 10^-24 eV < m_a < 10^-20 eV. However, other effects during propagation and reception of the radiation also modify its polarisation,...
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Prof. Tony Gherghetta (University of Minnesota)Invited Presentation
I will describe recent new perspectives on the QCD axion that go beyond the minimal picture, including the origin of the axion’s fundamental scale, how the underlying symmetry can be protected from quantum gravity, and mechanisms that modify the axion mass while still solving the strong CP problem. Together, these ideas can significantly redirect experimental search strategies and open...
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Gianluca LamannaInvited Presentation
The NA62 experiment at CERN is designed to measure the highly-suppressed decay $K^{+} \to \pi^{+}\nu\bar{\nu}$ and has collected a large sample of $K^+$ decays in flight during Run 1 (2016--2018) and Run 2 (2021--2026). Searches for the decay $K^{+}\rightarrow\pi^{+}X$ using data from 2016--2022, set upper limits on the branching ratio at the $10^{-11}$ level, constraining a broad range of...
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Akira Miyazaki (Université Paris-Saclay (FR))Poster Presentation
One of the major challenges facing current dark matter haloscopes is frequency tuning in a cryogenic environment. Mechanical tuning becomes increasingly impractical for plasma haloscopes operating above 20 GHz because of the extremely fine structure of the wire arrays. In this work, we propose a novel method for tuning the resonant frequency of plasma haloscopes through the kinetic inductance...
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Mr Arijit Das (Indian Institute of Science Education and Research, Thiruvananthapuram, India)Student/ECR Presentation
We construct an equation of state for isentropic dark-matter-admixed neutron stars (DMANS) with a hot core and relatively cold crust incorporating self-consistent temperature and DM density profiles for GeV-scale fermionic DM. We show that the enhancement of central stellar density due to DM accumulation, previously reported for cold neutron stars, remains robust. Substantial observable...
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Masahiro Ibe (Institute for Cosmic Ray Research, University of Tokyo)Poster Presentation
Cosmic strings are predicted in many extensions of the Standard Model. Depending on the symmetry-breaking pattern, they can be either stable or metastable. Metastable strings have recently attracted attention as a possible source of the stochastic gravitational-wave background reported by pulsar timing array experiments.
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When metastable strings decay, they fragment into segments ending on... -
37. ORGAN-Low : Pathfinder Search for Sub-μeV Axion Dark Matter with the Re-entrant Haloscope DesignRaj Aryan Singh (Swinburne University of Technology)Oral Presentation
The QCD axion remains one of the most compelling dark matter candidates, offering a simultaneous solution to the Strong CP problem and the nature of dark matter. Axion haloscopes search for this particle through its resonant conversion into microwave photons in a strong magnetic field, but most mature experimental sensitivity has so far been concentrated at GHz frequencies. The lower-frequency...
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Aaron Quiskamp` (UWA)Oral Presentation
The ORGAN (Oscillating Resonant Group AxioN) Experiment is Australia's axion haloscope program, searching for high-mass axion dark matter through a collaboration spanning the University of Western Australia and Swinburne University of Technology. Data-taking campaigns to date have placed leading exclusion limits on axion-photon coupling across the 25–112 μeV mass range, and the collaboration...
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Yue Meng (Shanghai Jiao Tong University)Oral Presentation
PandaX is a series of liquid xenon experiments at the China Jinping Underground Laboratory. Following the successful operation of PandaX-4T, the collaboration is now advancing toward the next-generation PandaX-20T experiment, with a substantially enlarged target mass and further improvements in detector performance and background control.
PandaX-20T will introduce major upgrades in key...
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Sanjay Sharma Poudel (University of Houston)Poster Presentation
DarkSide-20k is a dark matter direct detection experiment operating a dual-phase liquid argon time projection chamber (TPC) at the Laboratori Nazionali del Gran Sasso (LNGS). To reach its design sensitivity, the experiment requires a cosmogenic background contribution of less than 0.01 events over a 200 ton-year exposure. This strict requirement needs precise characterization of prompt fast...
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Satoshi Shirai (Kavli IPMU)Poster Presentation
Higgsino dark matter is one of the well-motivated candidates for weakly interacting massive particle WIMP dark matter. Collider searches provide an important and complementary probe of this scenario. Since Higgsinos form electroweak multiplets, the lightest neutral Higgsino dark matter candidate is accompanied by nearly degenerate charged and neutral Higgsino states. The collider phenomenology...
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Masahiro KawasakiOral Presentation
We investigate the formation of dark matter primordial black holes (PBHs) from two types of axion-like fields. In the first scenario, an axion-like field plays the role of the inflaton. We study PBH formation in axion inflation with a bumpy potential using lattice simulations. In particular, we compute the power spectrum of curvature perturbations in the strong backreaction regime and show...
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Shunsuke Neda (Institute for Cosmic Ray Research, The University of Tokyo)Oral Presentation
Non-topological solitons arising in theories beyond the Standard Model can generate sizable Poisson density fluctuations in the early Universe. If the solitons temporarily dominate the energy density, these fluctuations grow during the resulting early matter-dominated era and can collapse into primordial black holes (PBHs), providing a possible origin of dark matter. Previous studies of this...
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Jules COLASInvited Presentation
Cryogenic detectors are of great interest to search for the elusive signal induced by a light dark matter particle impinging inside a target material. Unfortunately, every cryogenic experiment with a very low energy threshold is limited by a low-energy excess background known as LEE whose origin is not totally understood to this date. The proposal of the TESSERACT collaboration is to bring...
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ippei obataOral Presentation
In this talk, I will present a novel method for probing Majoron dark matter using optical interferometry, such as that employed in gravitational wave detectors. The Majoron is a (pseudo-) Nambu-Goldstone boson that arises when a Majorana neutrino mass term is generated through the spontaneous breaking of a global Lepton symmetry, and has been proposed as a viable dark matter candidate in our...
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Mr Ryan Netrval (Max Planck Institute for Gravitational Physics)Poster Presentation
Vacuum magnetic birefringence is a QED prediction in which a magnetic field makes the vacuum optically anisotropic. The expected birefringence is extremely small, approximately $4 \times 10^{-24} ~[\mathrm{T}^{-2}] \cdot B^2$, and has not yet been directly measured. A major limitation of cavity enhanced polarimetry is intrinsic birefringence noise, likely dominated by thermal fluctuations in...
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Hajime Fukuda (University of Tokyo)Oral Presentation
We propose a quantum error correction-like noise mitigation protocol for enhancing the sensitivity of wave-like dark matter searches with quantum sensors. Our protocol uses multiple sensors to mitigate the noise affecting each sensor individually, allowing for the suppression of excitation noise that is parallel to the dark matter signal. We demonstrate that our protocol can improve the...
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Xiaolin Ma (KEK/QUP)Oral Presentation
Quantum geometric phases convert weak new-physics signals into measurable phases through controlled oscillator trajectories. I will discuss applications to bosonic dark matter and spin-dependent fifth forces. In cavity systems, coherent displacement and squeezing amplify the phase induced by dark photons or axions, enabling sensitivity beyond the standard quantum limit. In trapped ions, a...
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Robert James (The University of Melbourne)Invited Presentation
Dual-phase xenon time projection chambers are the leading technology in the search for WIMP dark matter. The LUX- ZEPLIN (LZ) experiment is the largest of its kind currently operating, deploying a 7 tonne liquid xenon active volume and two veto subsystems deep underground at the Sanford Underground Research Facility in Lead, South Dakota, USA. LZ currently boasts world-leading constraints on...
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Claire Laffan
HAYSTAC (Haloscope At Yale Sensitive To Axion CDM) is the first haloscope to leverage quantum squeezing to noiselessly amplify its cavity readout. This broadens the sensitivity bandwidth, allowing HAYSTAC to achieve a maximum scan-rate enhancement of 2x. In Phase I of data taking, HAYSTAC excluded axions between 23.55-24.0 μeV at the 90% confidence level. After implementing a squeezed-state...
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Giacomo D'AmicoOral Presentation
In the past decade, indirect searches for particle dark matter with gamma-ray experiments have placed stringent constraints on the annihilation cross section or decay lifetime across a wide range of dark matter masses. These limits depend critically on the astrophysical J factor, which encodes the dark matter distribution in the target and typically dominates the systematic uncertainty. As...
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Prof. Elisabetta Barberio (University of Melbourne)Invited Presentation
SABRE South is located at the Stawell Underground Physics Laboratory (SUPL), the only deep underground laboratory in the Southern Hemisphere, 1025 m underground (~2900 m water equivalent) in the Stawell Gold Mines, Victoria. The detector uses ultra-high-purity NaI(Tl) crystals with purity comparable to DAMA, combined with an active liquid scintillator and muon veto system. Together with its...
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Dr Yuan-Hann Chang (Academia Sinica (TW))Invited Presentation
The TASEH experiment searches for the Axion Dark Matter with a Haloscope detector, featuring a high-quality-factor cavity with tunable resonance frequency in a uniform magnetic field. The whole setup is maintain at a temperature of few tens of miliKelvin in a Dilution Refrigerator. The system design follows the concept developed by Sikivie and pioneered by ADMX and Haystack experiments....
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KARIN WATANABE (The University of Tokyo)Student/ECR Presentation
We present a search for hidden photon dark matter using superconducting qubits, based on the method proposed by our group (Moroi et al., Phys. Rev. Lett. 131, 211001 (2023)). Hidden photon dark matter induces an AC electric field through kinetic mixing with ordinary photons. This electric field can excite a qubit on resonance. Assuming that fake excitations form an approximately...
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Albert De Roeck (Imperial College London, UK)Oral Presentation
The search for millicharged particles (mCPs), which naturally arise in many Dark Sector models offering potential Dark Matter candidates, provides a unique opportunity to probe extensions of the Standard Model (SM). The milliQan experiment is an ongoing search for mCPs located just above the CMS experiment at the LHC and leverages this proximity along shielding from most SM backgrounds to gain...
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Dr Noah Kurinsky (SLAC National Accelerator Laboratory - Stanford University)Plenary Presentation
Over the past few decades, searches for ‘classical’ WIMPS at masses in the 10 GeV - 1 TeV regime have matured and ruled out a broad set of supersymmetric models. Along with mature concepts for reaching the neutrino floor in this mass range, significant progress has been made in understanding how we closed the mass gap between the younger set of axion experiments and the conventional...
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Tobias Schiffer (University of Bonn (DE))Invited Presentation
The sun could be a large axion emitter and thus an interesting object to study for axion searches. The International AXion Observatory (IAXO), as a next-generation axion helioscope, aims exactly for that purpose. The experiment will host a $20\,\text{m}$ long magnet with eight magnet bores and will be able to follow the sun for 12 hours per day. Each magnet bore will be equipped with a...
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Raphael CervantesInvited Presentation
The Superconducting Quantum Materials and Systems Center (SQMS) recently conducted a Dark Photon Dark Matter search in the 4.5 GHz to 7.1 GHz range using a widely-tunable superconducting haloscope. I will present the cavity design and characterization, analyze the impact of microphonics on system performance and haloscope sensitivity, and describe our tuning methodology for this Q~10^8 cavity....
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Andrew Yi (SLAC National Accelerator Laboratory)Plenary Presentation
QCD axions are the resulting bosons from the Peccei-Quinn mechanism which solves the strong CP problem, and are also a convincing candidate for wavelike dark matter. Located at the University of Washington, the Axion Dark Matter Experiment (ADMX) is an axion haloscope currently probing axions at Dine-Fischler-Srednicki-Zhitnitskii (DFSZ) sensitivities from 1.02 to 1.39 GHz (4.22 - 5.75 µeV)....
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Danho Ahn (INFN)Invited Presentation
The QUAX (QUaerere AXion) experiment searches for axion dark matter in the 35–45 μeV mass range (8.5–11 GHz) using two complementary cavity haloscopes covering distinct mass regions, located at INFN laboratories in Legnaro and Frascati. This talk will mostly present the results and status of the LNL haloscope, which has already reached near-KSVZ sensitivity above 40 μeV [1]. This is based on a...
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Qing Lin (University of Science and Technology of China)Oral Presentation
PandaX-4T is a multi-tonne liquid-xenon experiment searching for rare low-energy interactions, operating with a 3.7-tonne active target at the China Jinping Underground Laboratory (2400 m.w.e. overburden). In 2024, PandaX-4T reported the first indication of coherent elastic neutrino–nucleus scattering (CE𝜈NS) from solar B8 neutrinos using combined Run0 and Run1 data, with a significance of...
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Andrew Sonnenschein (Fermi National Accelerator Laboratory)
The Broadband Reflector Experiment for Axion Detection (BREAD) concept employs a novel coaxial dish antenna geometry to convert axions to photons in the background magnetic field of a large solenoid magnet. This detector geometry provides a scalable approach to detection of axions in mass ranges above the reach of the resonant cavity technique employed by the ADMX, HAYSAC and CAPP...
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Colin James Moore (Max-Planck-Institut für Physik)Invited Presentation
CRESST-III (Cryogenic Rare Event Search with Superconducting Thermometers), installed at Laboratori Nazionali del Gran Sasso, is looking to directly detect dark matter particles scattering off CaWO$_4$ target nuclei in cryogenic detectors. Thanks to its energy threshold O(30 eV), CRESST-III is particularly suitable in probing sub-GeV DM masses. This contribution presents an overview of...
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Kristof Schmieden (University of Bonn (DE))Invited Presentation
The SUPerconducting AXion search experiment, SUPAX, is a new axion haloscope currently being built at the University of Bonn to search for axion and axion-like particle dark matter in the microwave regime. The experiment will operate inside a 12 T superconducting solenoid at a base temperature of about 10 mK and will employ tunable microwave cavities covering resonance frequencies from 2 GHz...
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William Campbell (The University of Queensland)Poster Presentation
Recent experiments have suggested future particle dark matter searches can be improved and even performed entirely with superconducting circuits [1]. However, superconducting qubits are highly susceptible to quasiparticle generation from background ionizing radiation, which produces energetic phonons capable of breaking Cooper pairs and inducing correlated errors. Following the observation of...
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Ilya CharaevOral Presentation
The true nature of Dark matter (DM), a fundamentally new form of matter that contributes five times more to the energy density of the Universe than ordinary matter, remains one of the most profound open questions in fundamental physics. In recent years, new theoretical developments have motivated the search for DM particles in the sub-GeV mass ranges. Exploring the low-energy regime requires...
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Ethan Han (Swinburne University of Technology)Student/ECR Presentation
Superconducting RF cavities operating in magnetic fields are a promising technology for next generation axion dark matter searches, where ultra high quality factors are required to maximise detection sensitivity. Achieving these performance levels requires low loss superconducting surface coatings that retain their properties under strong magnetic fields and cryogenic conditions. A key...
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Aaron ChouInvited Presentation
Discovering the QCD axion will require a fleet of high-Q cavities, large magnets and cryostats, and background-free single photon detectors. In this talk, I will report on the successful operation of a novel dielectric cavity that is tunable over a 20% frequency range while maintaining high quality factor. Coupled with a qubit-based single microwave photon counter with similarly large...
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Lucas Puetter (ITP Heidelberg)Invited Presentation
We investigate how scalar-mediated potentials with Lorentz-violating couplings to Standard Model fermions affect spectroscopic observables in atoms and highly charged ions. Suitable combinations of an ordinary scalar and a time-like component of a Lorentz violating vector coupling allow for a split into "matter" and "antimatter" couplings, at least in the non-relativistic limit. By considering...
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Alexander Bohmer (Vienna University of Technology (AT))Oral Presentation
COSINUS is a cryogenic direct detection experiment for dark matter located at the Laboratori Nazionali del Gran Sasso (LNGS) Underground Laboratory in Italy. Its primary goal is to provide a model-independent crosscheck of the long-standing annual modulating claim by DAMA/LIBRA. Therefore, COSINUS uses the same absorber material (NaI) as in DAMA/LIBRA, but operates it with a...
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Jacob Mathias Egge (DESY)Poster Presentation
The DarkQuantum project aims to boost the sensitivity and mass reach of axion dark matter searches by embedding quantum sensing technologies into two haloscope implementations. A low-frequency setup, targeting the sub-GHz range, will operate inside a large-bore superconducting magnet and read out by a quantum-limited amplifier chain operating near the standard quantum limit at millikelvin...
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Jianyang Qi (Stockholm University)Poster Presentation
In order to look for axions with a mass above 40 μeV, one must construct a haloscope with a resonant frequency above 10 GHz. At these frequencies, conventional microwave cavity haloscopes have too small of a volume to practically search for higher mass axions. One may overcome this hurdle by constructing a cavity whose inner volume features an array of wires, thereby coupling the resonant...
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Aya Keller (Stanford University)Oral Presentation
DMRadio-50L is a lumped-element search for axion dark matter in the 5 kHz–5 MHz range, corresponding to axion masses of order 10⁻¹¹–10⁻⁸ eV. It combines a superconducting toroidal magnet, a high-Q tunable LC resonator, and a SQUID-based readout chain operating at mK temperatures to detect the narrowband electromagnetic response induced by axion dark matter.
This talk presents the first...
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Alessio Rettaroli (INFN - LNF)Invited Presentation
GravNet is an international collaboration developing a distributed network of quantum-enhanced haloscopes to search for light dark matter and high-frequency gravitational waves (HFGWs) in the MHz-GHz frequency range. By coherently combining time-synchronized resonant detectors, GravNet aims to significantly extend the sensitivity achievable with individual experiments. The collaboration...
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Charalampos NikolisPoster Presentation
Axion relic pockets are phase-transition remnants consisting of regions of false vacuum stabilised from collapse by a hot axion gas. Axion relic pockets can comprise dark matter, but little is known about their phenomenology. We consider trapped axions coupled to electromagnetism and show that axion-photon conversion occurs in atomic electric fields, leading to high-energy electromagnetic...
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Alexander Sushkov (Johns Hopkins University)Invited Presentation
Spin-based searches for new fundamental particles and fields use spin ensembles as transducers that are sensitive to spin interactions with fields beyond the standard model. The Cosmic Axion Spin Precession Experiment (CASPEr) is one example. For such searches, the standard quantum limit on sensitivity scales with the inverse square root of the number of spins. Consequently, increasing the...
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Suerfu Burkhant (The University of Melbourne)Oral Presentation
Recently, there has been an increasing interest in searching for low-mass dark matter. To address this new direction, a new experimental setup for low-mass dark matter searches has been commissioned at the Kamioka Underground Laboratory. A dilution refrigerator has been installed underground, and gamma and neutron shielding is under construction. Ambient gamma and neutron levels have been...
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Peter McNamaraInvited Presentation
SuperCDMS SNOLAB is a cryogenic experiment projected to achieve world-leading sensitivity for dark matter masses below 10 GeV using semiconductor crystal detectors. The experiment employs two detector types - iZIP detectors with combined phonon and charge readout providing excellent nuclear recoil/electron recoil discrimination, and HV detectors which amplify phonon energy proportional to an...
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David Marsh (Stockholm University)Invited Presentation
Axion relic pockets (ARPs) can form in cosmic phase transitions and comprise all of dark matter. The pocket interiors are filled by the false vacuum phase, stabilised against collapse by a hot, kinematically trapped axion gas: ARPs are balloons filled with relativistic axions. I will review the theory and phenomenology of ARPs, and report on recent progress in understanding their formation and...
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Robert Crew (University of Western Australia - QDM Lab)Student/ECR Presentation
We describe the readout system electronics used for detection of amplitude modulation sidebands induced by ultralight axions in a twisted anyon cavity. A twisted cavity with asymmetrical boundary conditions proposed in (Bourhill et al. 2023) was shown to generate helical radiation in a single eigenmode. That is, a single mode has a non-zero $\vec{E}\cdot \vec{B}$ product, hence can act as both...
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Jeremy BourhillOral Presentation
Twisted, helical "anyon" cavity resonators support bulk electromagnetic modes with nonzero helicity, a chiral property arising from the net parallel or antiparallel alignment of the eigenmode’s electric and magnetic fields. This property allows a single, monochromatic mode to couple directly to dark matter axions and convert them into amplitude-modulation sidebands via the axion-photon chiral...
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Erik Lentz (Pacific Northwest National Laboratory)Oral Presentation
The axion, first proposed to resolve the unobserved-yet-expected CP violation in QCD, is an excellent candidate for wave-like dark matter. The most successful experimental technique to search for galactic axions thus far, the cavity haloscope, is limited in both scan speed and accessible axion mass range (or frequency range), particularly above 1.5 GHz. Next generation axion haloscopes will...
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Graeme Flower (Universtiy of Western Australia)Oral Presentation
The use of travelling wave parametric amplifiers (TWPAs) represents a convenient and effective readout strategy for axion haloscope experiments. TWPAs produce many GHz of broadband gain, typically covering the entire range of an experimental run, with near-quantum-limited added noise that is increasingly competitive with that of their resonant, narrowband counterparts. Beyond low-noise...
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Muhammad Ghulam Khuwajah Khan (Indian Institute of Technology, Jodhpur)Poster Presentation
The microscopic identity of dark matter and the smallness of the observed
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vacuum energy remain two central puzzles in cosmology. I present a framework in which both questions are tied to a single additional gauge sector. In four spacetime dimensions, a three-form gauge field has a four-form field strength with no local propagating degrees of freedom. Instead, it labels distinct vacuum-energy... -
Yuya Mino (University of Tokyo)Poster Presentation
Dark matter searches using superconducting qubits have so far been carried out with qubits individually fabricated for quantum-sensing purposes. Extending such searches to a broadband scan over many candidate dark matter masses using multiple qubits, however, requires a large number of high-quality qubits with well-controlled properties. Superconducting quantum computers, in contrast, provide...
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Mustafa AminOral Presentation
Dark matter may be composed of sufficiently light bosonic fields, such as axions or dark photons, whose wave nature can affect structure formation on astrophysical and cosmological scales. In this talk, I will describe recent progress in connecting the early-universe production of such fields to their later gravitational evolution and observational signatures. Post-inflationary production...
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Prof. Anthony Williams (University of Adelaide)Oral Presentation
The absence of signals in Dark Matter (DM) detection experiments to date motivates scenarios in which the leading detection signals are absent or suppressed. We examine two such cases, using the framework of Effective Field Theory.
i) Pseudoscalar-mediated dark matter: For fermionic DM that is coupled to Standard Model (SM) fermions via pseudoscalar interactions, the tree-level elastic...
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Yi Tao (Sun Yat-sen University)Invited Presentation
The PandaX-4T experiment, a multi-tonne liquid xenon time projection chamber at the China Jinping Underground Laboratory, searches for dark matter through WIMP-induced nuclear recoils. In this talk, We will present the latest WIMP search results using the full-exposure data set of PandaX-4T. With improved signal reconstruction, detector calibration, and background modeling, new constraints on...
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Bingrong Yu (Cornell University)Oral Presentation
The microscopic nature of dark matter is the major open question in science. Weakly-Interacting Massive Particles (WIMPs) and Axion-Like Particles (ALPs) are the two most theoretically motivated dark matter candidates. Thousands of papers consider them separately. We point out that if both species are present in the theory, even a tiny (Planck-suppressed) interaction between them could lead to...
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Theresa Fruth (University of Sydney)Oral Presentation
Currently running two-phase xenon time-projection chambers are at the forefront of the search for dark matter interactions via nuclear recoils in the mass range above a few $\textrm{GeV}/\textrm{c}^{2}$. The XLZD collaboration brings together the expertise of the XENON, LUX-ZEPLIN and DARWIN collaborations to construct a next-generation experiment capable of exploring the WIMP parameter space...
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