165 citations · 1.7k across the 42 of their papers we have counts for
42 papers
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…
What would it take for dark matter to be literally warm?
Katelin Schutz
Warm dark matter (WDM) has served as a valuable benchmark for constraining small-scale structure in the past decades. In this note, I examine what it would take for dark matter to…
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…
Searching for axion dark matter gegenschein of the Vela supernova remnant with FAST
Wenxiu Yang, Yitian Sun, Yougang Wang +7
Axions are one of the leading dark matter candidates. If we are embedded in a Milky Way dark matter halo comprised of axions, their stimulated decay would enable us to observe a co…
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…
Endothermic self-interacting dark matter in Milky Way-like dark matter haloes
Stephanie O'Neil, Mark Vogelsberger, Saniya Heeba +9
Self-interacting dark matter (SIDM) offers the potential to mitigate some of the discrepancies between simulated cold dark matter (CDM) and observed galactic properties. We introdu…
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…
An Effective Bias Expansion for 21 cm Cosmology in Redshift Space
Wenzer Qin, Katelin Schutz, Aaron Smith +4
A near-future detection of the 21cm signal from the epoch of reionization will provide unique opportunities to probe the underlying cosmology, provided that such cosmological infor…
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…
The Galactic potential and dark matter density from angular stellar accelerations
Malte Buschmann, Benjamin R. Safdi, Katelin Schutz
We present an approach to measure the Milky Way (MW) potential using the angular accelerations of stars in aggregate as measured by astrometric surveys like Gaia. Accelerations dir…
The cosmology of sub-MeV dark matter freeze-in
Cora Dvorkin, Tongyan Lin, Katelin Schutz
Dark matter (DM) could be a relic of freeze-in through a light mediator, where the DM is produced by extremely feeble, IR-dominated processes in the thermal Standard Model plasma.…
The Subhalo Mass Function and Ultralight Bosonic Dark Matter
Katelin Schutz
Warm dark matter has recently become increasingly constrained by observational inferences about the low-mass end of the subhalo mass function, which would be suppressed by dark mat…