Conveners
Parallel 3: DM models I
- Keith A. Olive (University of Minnesota (US))
Parallel 3: Dark energy I
- Urjit Yajnik (IIT Bombay Mumbai India)
Parallel 3: Indirect detection
- Marianne Moore (MIT)
Parallel 3: Gravitational waves / phase transitions I
- Sergey Sibiryakov (McMaster U. & Perimeter Inst.)
Parallel 3: Terrestrial DM searches
- Miriam Diamond
Parallel 3: DM in halos II
- Liliya Williams (University of Minnesota)
Parallel 3: Axions
- SungWoo Youn (Institute for Basic Science)
Parallel 3: Sub-GeV and ultralight DM
- Patrick Foldenauer
In my presentation, I will investigate the interplay between dynamical symmetry breaking mechanisms and dark matter. More precisely, I will focus on several important details of the recently proposed Higgs-dilaton model augmented with a dark matter candidate inducing quantum corrections. In contrast to the previous studies, I will consider the effects of the renormalisation group improvement...
In this talk, I aim to present the phenomenology of Electroweak (EW) multiplets as potential Dark Matter (DM) candidates in the coming years. I will begin by discussing the thermal production mechanism in the early Universe and providing an overview of the current phenomenological landscape in the search for Weakly Interacting Massive Particles (WIMPs). It is worth emphasizing that WIMPs...
We study vector dark matter (DM) production with Higgs-portal type interactions in the scenarios with a low reheating temperature which can be realized by a prolonged decay of the inflaton after inflation. We take the reheating temperature to be large enough to match the observations in Standard Cosmology such as Big Bang Nucleosynthesis but small enough below the DM mass for the DM...
If dark matter is blind to standard model gauge interactions, the dark sector might not be totally secluded but connect to the visible sector via the introduction of portal interactions. In this talk, I will discuss a novel scenario where an axion-like particle acts as mediator between the SM and a complex scalar singlet dark matter candidate. The identification of physical couplings crucially...
Recent observations suggest dark energy might have been of phantom type in the past, implying violation of the null energy condition (NEC). It is a well-known fact that quantum states can violate the NEC, but at the same time, it is a challenge to come up with theoretically robust and stable quantum field theories that could behave as phantom dark energy. In fact, there should be a theoretical...
In light of recent observations by the Dark Energy Spectroscopic Instrument (DESI), we study evidence for thawing quintessence over a cosmological constant as dark energy, with emphasis on the effect of the choice of priors. Working with a parametrization for the equation of state parameter motivated by the theory, we analyse the DESI BAO data jointly with Planck 2018 and Pantheon+ supernovae...
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.
In the era of upcoming cosmic surveys, the bright sky will be more revealing than ever, allowing us to disentangle the most intriguing mysteries of the origins, content, and evolution of the universe. In this talk, I will highlight the fundamentals of extended gravity theories, and I will focus on the quintessence, probabilistic gravity, and functors of action theories (FAT). I will emphasize...
It is well-established that Dark Matter can be captured and accumulate in celestial objects. While this phenomenon has been extensively studied for the Sun and Earth, recent interest has shifted towards compact objects such as White Dwarfs and Neutron Stars. In this presentation, I will discuss two recent results related to these objects.
For Neutron Stars, we consider Dark Matter...
The detection of dark matter presents one of the greatest challenges of modern astronomy.
Possibly one of the most promising avenues is via high energy particles created by dark matter self-annihilation events.
These annihilation events, naturally, depend strongly on the particle physics of the dark matter, but also on the astrophysics of the Universe.
More specifically, the small...
The primary science goal of the General Anti Particle Spectrometer (GAPS) is to search for light antinuclei in cosmic rays at kinetic energies below 0.25 GeV/n, as a possible indirect dark matter signature. GAPS is a balloon-borne cosmic-ray experiment expected to be launched during the Antarctic summer season 25/26. It consists of a ten-layer silicon tracker, cooled by a novel oscillating...
Phase transitions in the early universe provide a rich testing ground for fundamental symmetries and the generation of gravitational waves. In this talk, I will explore the connection between symmetry breaking, phase transitions, and the resulting gravitational wave signatures. I will present recent theoretical and numerical developments that shed light on the dynamics of these transitions,...
The stochastic gravitational wave background (SGWB) has recently emerged as a promising new probe of new particle physics and the dark side of the Universe. In this talk, we present well-motivated examples of SGWB sourced by the early Universe dynamics of light scalar fields with masses well below the electroweak scale. These include mechanisms such as post-inflation parametric resonance of...
A number of theories predict that dark matter is a very massive particle or composite state. Discovering dark matter in this high mass regime requires different approaches. This talk covers recent developments, including composite dark matter that produces unique signatures in underground experiments and dark matter detectable through Bremsstrahlung radiation in Antarctic ice. We also survey...
Composite dark matter models, where dark matter exists in bound states formed in the early universe, have long been a source of scientific interest. In this talk, I will focus on loosely bound dark matter composite states, where the binding energy per constituent is small compared to the constituent’s bare mass. If this binding energy is sufficiently small, scattering with Standard Model...
Located 2km underground at SNOLAB, the SuperCDMS (CryogenicDark Matter Search) experiment is currently being constructed and will focus on the detection of low-mass (<10 GeV/c2) dark matter particles. The experiment will utilize 6 silicon, and 18 germanium cryogenic calorimeters arranged in 4 detector towers. There are two types of individual detectors: HV and iZIP. The HV detectors are...
We investigate the possibility that parametric resonant excitation of photons in an ultralight dark matter halo could generate the required flux of Lyman-Werner photons to allow the direct collapse formation of supermassive black hole seeds. This scenario provides a plausible explanation for the origin of quasars observed at high redshifts.
As the search for dark matter progresses, it is useful to refine past and future searches for heavy dark matter, including for dark matter masses well above a TeV. I demonstrate the importance of properly modelling the local dark matter velocity distribution, beyond the standard Maxwellian halo model, and in particular how accurate modeling of the Large Magellanic Cloud and Milky Way impact...
For nearly five decades, the interplay between dark matter (DM) halos and baryonic (or luminous) matter has shaped our understanding of galaxy formation and evolution. Recent observational data (e.g., the latest DESI results) suggests that the standard $\Lambda$-CDM model, although remarkably successful, may need to be revisited to fully explain the Universe. This tension motivates a more...
Cold dark matter halos are known to harbor universal density profiles such as the NFW, Einasto and prompt cusp profiles in cosmological N-body simulations. Despite decades of research, the origin of these profiles has remained elusive. I will present a first principles kinetic theory calculation based on the Vlasov-Poisson equations that, for the first time, provides a microscopic description...
We demonstrate that the co-genesis of baryon asymmetry and dark matter can be achieved through the rotation of an axion-like particle, driven by a flip in the vacuum manifold's direction at the end of inflation. This can occur if the axion has a periodic non-minimal coupling to gravity, while preserving the discrete shift symmetry. In non-oscillating inflation models, after inflation there is...
Some of the most stringent constraints on axions arise from considerations of it's emission from astrophysical plasmas. However, many studies assume that particle production occurs in an isotropic plasma environment. This condition is rarely (if ever) met in astrophysical settings, for instance due to the ubiquitous presence of magnetic fields. The effects of the magnetic fields are only taken...
The Earth's ionosphere provides a natural laboratory for searching for
resonant conversion of axions. When the peak plasma frequency in
the ionosphere rises above the axion conversion frequency, a narrow
spectral line will appear. ALBATROS is an array of low-frequency
radio telescopes observing the sky at low frequencies (~10 MHz and
below) from Axel Heiberg Island in the Canadian High...
In recent years, attention has shifted to probes of sub-GeV dark matter. In this work, we explore the direct detection prospects of crystal targets through their single (or multi) phonon response to dark matter scattering in the keV-GeV mass range, which couples effectively to protons/neutrons via spin-dependent interactions. In particular, we consider coupling the SM to the dark matter...
We study a mechanism to make dark matter stable based on the Pauli blocking in the fermion background. We examine this scenario in both Boltzmann equation and quantum field formulation and evaluate the evolution equations. We apply this mechanism to a realistic model of neutrino and dark matter.
We propose a mechanism for the generation of magnetic fields on cosmological scales that is operative after recombination. An essential
ingredient is an instability of the electromagnetic field driven by an oscillating pseudo-scalar dark matter field, $\phi$, that is coupled to the electromagnetic field tensor via a $\phi F \wedge F$ term in the Lagrangian of axion-electrodynamics. We find...
In the Fuzzy Dark Matter (FDM) scenario, the dark matter is composed of an ultra-light scalar field with coherence length and wave interference on astrophysical scales. Scalar fields generically have quartic self-interactions that modify their dispersion relation and the associated evolution of density perturbations. In this talk, I will present the first dedicated analysis of the relationship...
Strongly interacting dark sectors, colloquially referred to as dark-QCD, is becoming increasingly popular in the collider community, primarily because of the rich phenomenology and the novel signatures it offers. The author pioneered the first search for semi-visible jets in ATLAS, and is following that up with multiple studies focussing on other final states (arXiv:2207.01885), new generator...
Based on arXiv: 2409.13022 (published in ApJ Letters). We update constraints on cosmological parameters in a 12-parameter model, which extends the standard 6-parameter ΛCDM to include dynamical dark energy and massive neutrinos, along with other new parameters. We use the latest Planck PR4 (2020) likelihoods, DESI DR1 BAO, and the latest uncalibrated type Ia Supernovae (SNe) datasets. In this...
The mystery of dark matter (DM) is a long-standing issue in physics, with numerous dedicated experiments returning no confirmed detections. As many direct detection experiments rely on catching a signal of nuclear recoil, these types of experiments are not applicable to many DM models.
Instead, we can utilise the precision that atomic physics allows to search for potential interactions...
Axions with a mass around 1 eV can decay into near-infrared photons. Using blank-sky observations from the James Webb Space Telescope, I search for a narrow emission line due to decaying dark matter and derive leading constraints on the axion-photon coupling in the eV-scale mass range.
Sub-GeV neutrinos produced in a stellar core may emerge from main sequence stars, white dwarfs and brown dwarfs producing possible observable signals of dark matter capture. A distribution of these stars near the Milky Way galactic center will produce a neutrino flux that can be probed at Earth based neutrino observatories like Super-Kamiokande and Hyper-Kamiokande. In this talk we demonstrate...
Primordial gravitational waves (GWs) provide a unique way to look into the early Universe, revealing the connection among inflationary reheating, dark matter (DM) and baryogenesis. I will explore how distinct GW signatures can test new physics scenarios beyond the standard model, offering insights into the fundamental nature of the DM and leptogenesis. I will first discuss how inflationary GWs...
