Conveners
Parallel 1: Direct detection I
- Laura Baudis (University of Zurich (CH))
Parallel 1: DM in halos I
- Annika Peter
Parallel 1: Direct detection II
- Matthew Szydagis
Parallel 1: Dark energy II
- Robert Brandenberger (McGill University)
Parallel 1: Black holes / remnants II
- Edward Wilson-Ewing (University of New Brunswick)
Parallel 1: Supernovae
- Michael Stadlbauer
Parallel 1: Astrophysical / cosmological DM probes I
- Christopher Cappiello
Parallel 1: Gravitational waves / phase transitions II
- Csaba Balazs
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Ran Budnik07/07/2025, 13:30
The XENONnT experiment is designed for the direct detection of WIMP Dark Matter through its scattering off atomic nuclei in a liquid xenon (LXe) time projection chamber (TPC). The detector, located at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, holds a total of 8.6 tonnes of xenon, of which 5.9 tonnes actively instrumented within the TPC. Searching for extremely rare interactions,...
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Prof. Matthew Szydagis (UAlbany SUNY)07/07/2025, 13:50
The LUX-ZEPLIN collaboration operates a 7-tonne active mass, two-phase xenon Time Projection Chamber surrounded by multiple anti-coincidence vetoes. In its search for the elusive dark matter, the LZ experiment involves researchers from 6 countries and 4 continents. It is located at the Sanford Underground Research Facility in Lead, South Dakota. LZ seeks standard Weakly Interacting Massive...
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Daniel Marcantonio (U. Melbourne)07/07/2025, 14:10
The Belle and Belle II experiment have collected samples of $e^+e^-$
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collision data at centre-of-mass energies near the $\Upsilon(nS)$
resonances. These data have constrained kinematics and low
multiplicity, which allow searches for dark sector particles in the mass
range from a few MeV to 10 GeV. Using a 426 fb$^{-1}$ sample collected
by Belle II, we search for inelastic dark matter... -
Colin James Moore (Max-Planck-Institut für Physik)07/07/2025, 14:30
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 CaWO4 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 CRESST-III,...
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54. COSINUS – A NaI cryogenic calorimeter to resolve the long standing DAMA/LIBRA dark matter claim.Dr Matthew Stukel (SNOLAB)07/07/2025, 14:50
Over the past twenty-eight years, the DAMA/LIBRA experiment has observed an annual modulation signal that is consistent with a dark matter explanation. Unfortunately, the signal is contradicted by the null results of numerous experiments utilizing different target materials. In order to perform a truly model-independent investigation of the DAMA/LIBRA result, a study with the same target...
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Cosmin Ilie (Colgate University)07/07/2025, 15:40
Launched at the end of 2021, the James Webb Space Telescope (JWST) has already begun to revolutionize our view of the cosmic dawn era. Specifically, it discovered an unexpectedly large number of extremely bright objects in the sky from the early Universe, whose light was emitted more than thirteen billion years ago. If these objects are interpreted as some of the first galaxies ever...
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Liliya Williams (University of Minnesota)07/07/2025, 16:00
Observations of intermediate mass and dwarf galaxies are hard to reconcile with the results of numerical simulations of cold collisionless dark matter (CDM). The most notable problems are (i) the core-cusp problem, or the inability of DM-only simulations to reproduce flat density profiles, i.e., cores, in the centers of dwarf galaxies, (ii) the diversity of the central density profile slopes,...
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Bianca-Iulia Ciocan (Centre de recherche astrophysique de Lyon (CRAL))07/07/2025, 16:20
Disk-halo decompositions of star-forming galaxies (SFGs) at redshifts z > 1 typically focus on massive galaxies with stellar masses exceeding log(M⋆/M⊙) > 10.
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In this study, we analyse the dark matter (DM) halo properties of 127 intermediate-redshift (0.3 < z < 1.5) SFGs down to low stellar masses (7 < log(M⋆/M⊙) < 11). To do so, we use integral field unit observations from the MUSE Hubble... -
Pierce Giffin07/07/2025, 16:40
If the dark sector possesses long-range self-interactions, these interactions can source dramatic collective instabilities even in astrophysical settings where the collisional mean free path is long. Here, we focus on the specific case of dark matter halos composed of a dark $U(1)$ gauge sector undergoing a dissociative cluster merger. We study this by performing the first dedicated...
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Zihui Wang07/07/2025, 17:00
We investigate the astrophysical consequences of an attractive long-range interaction between dark matter and baryonic matter. Our study highlights the role of this interaction in inducing dynamical friction between dark matter and stars, which can significantly influence the evolution of compact stellar systems. Using the star cluster in Eridanus II as a case study, we derive a new stringent...
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Yi Yi Zhong (The Australian National University, Canberra, Australia; ARC Centre of Excellence for Dark Matter Particle Physics, Australia)08/07/2025, 13:30
SABRE is an international collaboration that will operate similar particle de-
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tectors in the Northern (SABRE North) and Southern Hemispheres (SABRE
South). This innovative approach distinguishes possible dark matter signals
from seasonal backgrounds, a pioneering strategy only possible with a southern
hemisphere experiment. SABRE South is located at the Stawell Underground
Physics... -
Volker Andreas Austrup (The University of Manchester (GB))08/07/2025, 13:50
The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS Collaboration has developed a broad search program for DM candidates in final states with large missing transverse momentum produced in association...
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Niklas Zimmermann (Helsinki Institute of Physics (FI))08/07/2025, 14:10
The initiative to detect dark matter directly has been prominent for decades after the WIMP miracle was proposed. Following this, many institutions have come forward with a variety of dark matter direct detection experiments, each trying to find the possible missing particle of the universe. Most prominently, the DAMA collaboration published their results during the end of the last century,...
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Audrey Fung08/07/2025, 14:30
Paleodetection has been proposed as a competitive method for detecting dark matter and other new physics interactions, complementing conventional direct detection experiments. In this work, we utilise \trim simulations to improve the modelling of track length distributions. Our findings suggest that previous studies have overestimated the number of tracks caused by weakly interacting...
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Prof. Jong-Chul Park (Chungnam National University (KR))08/07/2025, 14:50
We propose a novel method to determine the mass scale of ambient dark matter that can be generally applied to the (at least effectively) two-dimensional direct detection experiments allowing for directional observables. Due to the motions of the solar system and the Earth relative to the galactic center and the Sun, the dark-matter flux carries a directional preference. We first formulate that...
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Claia Bryja (City College of San Francisco)08/07/2025, 15:40
Within present observational uncertainties, the time evolution of dark
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energy discovered by DESI (2025) is consistent with a simple model in
which the dark energy density maintains a direct dependence on the
${\mid \Omega - 1 \mid}$ measure of spatial curvature. This, together
with Bousso’s (2002) conjecture that the holographic bound of the
universe saturates at the observer’s apparent... -
Armine Amekhyan (A. I. Alikhanyan national science laboratory (Yerevan Physics Institute)" foundation)08/07/2025, 16:00
We consider different observational effects to test modified gravity approach involving the cosmological constant in the common description of the dark matter and the dark energy. We obtain upper limits for the cosmological constant by studying the scaling relations for 12 nearby galaxy clusters, the radiated power from gravitational waves and the Tully-Fisher relation for super spiral...
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Varun Muralidharan08/07/2025, 16:20
Recent analyses from the DESI collaboration suggest that the dark energy density of the Universe may be decreasing with time, slowing the acceleration of the scale factor $a$. Typically these studies are performed assuming an ansatz for the equation of state $w(a)$. In this talk, we present simple models of a scalar quintessence potential with linear and quadratic behavior, which could be...
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James Cline (McGill University, (CA))08/07/2025, 16:40
The Dark Energy Spectrometer Instrument second data release has
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strengthened indications of evolving dark energy, possibly including
the violation of the null energy condition $\rho > -p$. It is suggested that
the dark energy equation of state evolved from $w < -1$ to $w > -1$,
known as crossing the phantom divide. I will discuss
challenges to constructing theoretical models realizing... -
Meng-Xiang Lin (University of Pennsylvania)08/07/2025, 17:00
The fundamental natures of dark energy and dark matter remain two of the biggest mysteries in modern cosmology. We show that a simple coupling between dark energy and dark matter can simultaneously address two distinct hints at new physics coming from cosmological observations. The first is the recent evidence from the DESI project and supernovae observations that the dark energy equation of...
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Sohan Ghodla (Colgate University)09/07/2025, 11:00
The global network of pulsar timing arrays have recently announced the detection of a stochastic gravitational wave background (SGWB) in the nano-Hertz frequency regime. In this talk, I will discuss the implications of early seeding of supermassive black holes (SMBHs) for the observed SGWB. Assuming that these SMBHs were seeded by the collapse of supermassive, dark matter–powered stars (dark...
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Yacine Ali-Haimoud (New York University)09/07/2025, 11:20
Dark matter (DM) might have non-gravitational interactions with the standard sector, which would leave signatures in the cosmic microwave background (CMB). Traditional searches for such interactions focus on their imprints in CMB power spectra, or 2-point functions. In this talk I will argue that there is valuable information in both the CMB monopole's frequency spectrum, i.e. deviations...
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Benjamin Lehmann (Massachusetts Institute of Technology)09/07/2025, 11:40
Compact objects as dark matter have historically been constrained by their dynamical effects. Since these objects can participate in hard few-body scattering processes, they can readily transfer energy to visible objects, with effects such as the disruption of wide binaries. However, binary disruption is not the only possible outcome of such few-body encounters. I will discuss recent work on...
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Yitian Sun (McGill)09/07/2025, 12:00
Before reionization, the universe acts as a pristine calorimeter for detecting potential energy injections from primordial black holes and decaying or annihilating dark matter. The injected high-energy particles can alter the thermal and ionization states of hydrogen, leaving imprints on the 21-cm line signal. These energy injection sources are inherently inhomogeneous, as they depend on...
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Philippe ROSNET (LPCA, Université Clermont Auvergne & CNRS/IN2P3)10/07/2025, 13:30
The Zwicky Transient Facility (ZTF) is scanning the Northern sky since 2018 with a 1.2 m class telescope installed at the Mont Palomar Observatory. This survey detects any transient in the nearby Universe within its magnitude limit, typically up to a redshift of 0.15. In February 2025, the Cosmology working group has released a set of more than 3600 Type Ia supernovae (SN Ia) corresponding to...
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Chloé Barjou-Delayre (LPCA (Laboratoire de Physique Clermont Auvergne))10/07/2025, 13:50
The cosmological principle assumes the isotropy of the Universe. The high coverage of the Zwicky Transient Facility survey (ZTF) makes it possible to carry out an unprecedented study of the veracity of this principle by using observation of type Ia supernovae (SNe Ia).
This unique low redshift (z<0.15) survey with more than 3000 SNe Ia in the second data release (ZTF-DR2-SNe Ia) increases...
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Stefan Vogl (University of Freiburg)10/07/2025, 14:10
Supernova explosions are extreme cosmic events that may impact not only ordinary matter but also dark matter (DM) halos. In this talk, I explore the possibility that a fraction of supernova energy is released as dark radiation, which could transform a cuspy DM halo into a cored one, potentially explaining observed cores in some dwarf galaxies. Alternatively, limits on DM core sizes provide...
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Philippe Gris (Université Clermont Auvergne (FR))10/07/2025, 14:30
The Vera C. Rubin Observatory will conduct the Legacy Survey of Space and Time (LSST), a synoptic astronomical survey of large étendue (more than 20000 deg2) starting in october 2025. A systematic scan of the celestial sphere will be perform for ten years, leading to the largest astronomical catalog ever compiled (83 pB) with 17 billions of stars and 20 billions of galaxies.
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With a high... -
Christopher Cappiello10/07/2025, 14:50
Supernova cooling has long been used to constrain physics beyond the Standard Model, typically including new mediators or dark matter particles that couple to protons or electrons. The large density of neutrinos inside supernovae also makes supernovae powerful laboratories to study non-standard neutrino interactions. In this work, we consider supernova production of dark matter that couples...
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Leo Kim10/07/2025, 15:40
Dark compact objects can arise naturally in a variety of dark sectors. Clouds of dark matter between a source star and an observer could effectively act as a "lampshade" and dim starlight if the dark sector couples to the Standard Model photon. These dimming effects can be searched for in microlensing surveys, which measure the brightness of stars as a function of time. By considering the...
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Dr Sergey Sibiryakov (McMaster U. & Perimeter Inst.)10/07/2025, 16:00
The gravitational lensing parallax of gamma-ray bursts (GRB), also known as picolensing, is a promising probe of compact dark matter, such as primordial black holes (PBH). A future space mission consisting of two X-ray/gamma-ray detectors in the Swift/BAT class can probe PBHs in the asteroid-mass window — a range of masses that has been notoriously hard to constrain by any other means. I will...
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Marianne Moore (MIT)10/07/2025, 16:20
The annihilation of accumulated dark matter within planetary bodies could lead to observable signatures in the form of anomalous UV airglow and excess internal heat flow. We use existing UV and IR spectral data obtained by spaceprobe flybys of Solar System planets to constrain such effects. By comparing the measured spectra to potential dark matter-induced emissions, we place limits on...
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Jared Barron10/07/2025, 16:40
Many extensions of $\Lambda$CDM with additional complexity in the dark sector introduce modifications to the matter power spectrum, often appearing only at small scales. For models with interactions between a component of the dark matter and a dark radiation species at early times, the linear matter power spectrum incurs a suppression and dark acoustic oscillations (DAOs) on small scales. One...
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Tomasz Dutka (Korea Institute for Advanced Study)11/07/2025, 11:10
The nature of a certain type of supercooled phase transition, where the supercooling is guaranteed to end due to the curvature of the potential at the origin experiencing a sign flip at some temperature. As the potential barrier is quickly vanishing at the temperature scale of the phase transition, is not immediately clear if critical bubbles are able to form. This clearly can have large...
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Cassandra Moats (Fisk University)11/07/2025, 11:30
Primordial black holes (PBHs) have been invoked as a component of dark matter, and PBH mergers will produce copious gravitational radiation. The future launch of the Laser Interferometer Space Antenna (LISA), an ESA/NASA gravitational wave observatory set to launch in 2035, will open a new low-frequency band of the gravitational wave sky, one that may include PBH mergers. Our work focuses on...
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Andrija Rasovic11/07/2025, 11:50
Stochastic gravitational wave (GW) backgrounds from first-order phase transitions are a compelling target for next-generation GW observatories, offering a novel probe of dark sectors with strong phase transitions. However, reliable theoretical predictions for the GW signal strength remain challenging, particularly beyond the high-temperature regime where standard techniques like dimensional...
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Reiko Harada (the University of Tokyo)11/07/2025, 12:10
Gravitational waves from compact binary coalescences offer a promising avenue for inferring the Hubble parameter independently of electromagnetic distance ladders or cosmic microwave background observations. As an independent probe of cosmic expansion, it has the potential to contribute to ongoing efforts to resolve the Hubble tension and to shed light on the properties of the dark sector. In...
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Dr Sergey Sibiryakov (McMaster U. & Perimeter Inst.)11/07/2025, 12:30
False vacuum decay (aka first-order phase transition) in field theory at high temperature proceeds via formation of bubbles of new phase inside the old phase. This process has been extensively discussed in cosmology in relation to baryogenesis and as possible source of gravitational waves. It is traditionally described using the methods of statistical physics which rely on thermal equilibrium...
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Aidan Reilly (SLAC/Stanford)
Dark kinetic heating of neutron stars has been extensively studied as a promising dark matter detection avenue. This occurs when dark matter is accelerated to relativistic speeds in the gravitational well of high-escape velocity objects, and deposits its kinetic energy after becoming captured by the object, thereby increasing its temperature. I will show how this effect can also arise in...
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Ranjeet Kumar (IISER Bhopal)
We present a novel framework for dark matter induced proton decay. This scenario arises naturally from a $U(1)_{B+L}$ symmetry, whose spontaneous breaking triggers the proton decay. This breaking leads to a residual $Z_4$ subgroup, which ensures dark matter stability and forbids proton decay at tree level. Consequently, proton decay occurs at the one-loop level, mediated by dark sector...
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Patrick Adolf
Motivated by the work of Cohen, Kaplan and Nelson (CKN) in which the authors argue that gravity resticts the range of validity of a QFT, we consider a time-dependent dark energy density, scaling proportional to the squared Hubble parameter $H(z)$.
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These models are of particular interest in the light of the recent data release of the DESI collaboration, since the measurements show an... -
Zihui Wang
We investigate the astrophysical consequences of an attractive long-range interaction between dark matter and baryonic matter. Our study highlights the role of this interaction in inducing dynamical friction between dark matter and stars, which can significantly influence the evolution of compact stellar systems. Using the star cluster in Eridanus II as a case study, we derive a new stringent...
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Prof. Robert Brandenberger (McGill University)
The recent DESI results provide increasing evidence that the density of dark energy is time- dependent. I will recall why, from the point of view of fundamental theory, this result should not be surprising.
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