165 citations · 1.7k across the 42 of their papers we have counts for
22 papers · 1 filter
New bounds on light scalars from the tip of the red giant branch
Natnael Debru, Audrey Fung, Saniya Heeba +3
Light, weakly coupled particles can be copiously produced in the hot and dense interior of stars, and the resulting energy loss can leave observable imprints on entire stellar popu…
Resonant axion and dark photon production in magnetic white dwarfs
Nirmalya Brahma, Ella Iles, Hugo Schérer +1
Using magnetic white dwarfs as a case study, we show that the emission of sub-MeV bosons from stellar plasmas can be substantially modified in the presence of a magnetic field. In…
Photon conversion to axions and dark photons in magnetized plasmas: a finite-temperature field theory approach
Nirmalya Brahma, Katelin Schutz
Some of the most stringent constraints on physics beyond the Standard Model (BSM) arise from considerations of particle emission from astrophysical plasmas. However, many studies a…
Direct Detection of the Millicharged Background
Ella Iles, Saniya Heeba, Katelin Schutz
We show that dark matter direct detection experiments are sensitive to the existence of particles with a small effective charge (for instance, via couplings to a kinetically mixed,…
Photon self-energy at all temperatures and densities in all of phase space
Hugo Schérer, Katelin Schutz
In an isotropic background comprised of free charges, the transverse and longitudinal modes of the photon acquire large corrections to their dispersion relations, described by the…
Looking in the axion mirror: An all-sky analysis of stimulated decay
Yitian Sun, Katelin Schutz, Harper Sewalls +2
Axion dark matter (DM) produces echo images of bright radio sources via stimulated decay. These images appear as a faint radio line centered at half the axion mass, with the line w…
New bounds on light millicharged particles from the tip of the red-giant branch
Audrey Fung, Saniya Heeba, Qinrui Liu +3
Stellar energy loss is a sensitive probe of light, weakly coupled dark sectors, including ones containing millicharged particles (MCPs). The emission of MCPs can affect stellar evo…
Photon-Dark Photon Conversion with Multiple Level Crossings
Nirmalya Brahma, Asher Berlin, Katelin Schutz
Dark photons can oscillate into Standard Model (SM) photons via kinetic mixing. The conversion probability depends sensitively on properties of the ambient background, such as the…
Resonant Pseudo-Dirac Dark Matter as a Sub-GeV Thermal Target
Nirmalya Brahma, Saniya Heeba, Katelin Schutz
Dark matter (DM) could be a pseudo-Dirac thermal relic with a small mass splitting that is coupled off-diagonally to a kinetically mixed dark photon. This model, particularly in th…
Inelastic Freeze-in
Saniya Heeba, Tongyan Lin, Katelin Schutz
Dark matter (DM) could be a nonthermal relic that freezes in from extremely weak, sub-Hubble annihilation and decay of Standard Model (SM) particles. The case of Dirac DM freezing…
Report of the Topical Group on Cosmic Probes of Dark Matter for Snowmass 2021
Alex Drlica-Wagner, Chanda Prescod-Weinstein, Hai-Bo Yu +37
Cosmological and astrophysical observations currently provide the only robust, positive evidence for dark matter. Cosmic probes of dark matter, which seek to determine the fundamen…
The Physics of Light Relics
Cora Dvorkin, Joel Meyers, Peter Adshead +19
Many well-motivated extensions of the Standard Model predict the existence of new light species that may have been produced in the early universe. Prominent examples include axions…
Dark Matter Physics from the CMB-S4 Experiment
Cora Dvorkin, Renée Hlozek, Rui An +10
The nature of dark matter is one of the major puzzles of fundamental physics, integral to the understanding of our universe across almost every epoch. The search for dark matter ta…
Snowmass2021 Cosmic Frontier White Paper: Dark Matter Physics from Halo Measurements
Keith Bechtol, Simon Birrer, Francis-Yan Cyr-Racine +41
The non-linear process of cosmic structure formation produces gravitationally bound overdensities of dark matter known as halos. The abundances, density profiles, ellipticities, an…
Early-Universe Model Building
Pouya Asadi, Saurabh Bansal, Asher Berlin +37
Theoretical investigations into the evolution of the early universe are an essential part of particle physics that allow us to identify viable extensions to the Standard Model as w…
A Helioscope for Gravitationally Bound Millicharged Particles
Asher Berlin, Katelin Schutz
Particles may be emitted efficiently from the solar interior if they are sufficiently light and weakly coupled to the solar plasma. In a narrow region of phase space, they are emit…
Axion dark matter-induced echo of supernova remnants
Yitian Sun, Katelin Schutz, Anjali Nambrath +2
Axions are a theoretically promising dark matter (DM) candidate. In the presence of radiation from bright astrophysical sources at radio frequencies, nonrelativistic DM axions can…
A Predictive Mirror Twin Higgs with Small Breaking
Keisuke Harigaya, Robert McGehee, Hitoshi Murayama +1
The twin Higgs mechanism is a solution to the little hierarchy problem in which the top partner is neutral under the Standard Model (SM) gauge group. The simplest mirror twin Higgs…
Making dark matter out of light: freeze-in from plasma effects
Cora Dvorkin, Tongyan Lin, Katelin Schutz
Dark matter (DM) could couple to particles in the Standard Model (SM) through a light vector mediator. In the limit of small coupling, this portal could be responsible for producin…
SIMPs through the axion portal
Yonit Hochberg, Eric Kuflik, Robert McGehee +2
Dark matter could be a thermal relic comprised of strongly interacting massive particles (SIMPs), where interactions set the relic abundance. Such interactions ge…
On the Detectability of Light Dark Matter with Superfluid Helium
Katelin Schutz, Kathryn M. Zurek
We show that a two-excitation process in superfluid helium, combined with sensitivity to meV energy depositions, can probe dark matter down to the ~keV warm dark matter mass limit.…
Self-Scattering for Dark Matter with an Excited State
Katelin Schutz, Tracy R. Slatyer
Self-interacting dark matter scenarios have recently attracted much attention, as a possible means to alleviate the tension between N-body simulations and observations of the dark…