123 citations · 691 across the 20 of their papers we have counts for
15 papers · 1 filter
Re-examining the sensitivity of JWST to decaying axion dark matter
Caleb Gemmell, Christopher Dessert, Andrea Caputo +1
An eV-scale QCD axion comprising the observed dark matter (DM) abundance is expected to generate a photon line at infrared energies that would be observable or near-observable in d…
Freezing-in the Axiverse
Christopher Dessert, Soubhik Kumar, Joshua T. Ruderman
The presence of multiple light axions in the infrared is a generic feature of many ultraviolet (UV) scenarios. In many cases the number of axions is o…
Search for Axions in Magnetic White Dwarf Polarization at Lick and Keck Observatories
Joshua N. Benabou, Christopher Dessert, Kishore C. Patra +4
We present the most sensitive search to date for light axion-like particles with masses below a micro-eV, using spectropolarimetric data collected from the Lick and Keck Observator…
Sensitivity of JWST to eV-Scale Decaying Axion Dark Matter
Sandip Roy, Carlos Blanco, Christopher Dessert +2
The recently-launched James Webb Space Telescope (JWST) can resolve eV-scale emission lines arising from dark matter (DM) decay. We forecast the end-of-mission sensitivity to the d…
Snowmass Theory Frontier: Astrophysics and Cosmology
Daniel Green, Joshua T. Ruderman, Benjamin R. Safdi +84
We summarize progress made in theoretical astrophysics and cosmology over the past decade and areas of interest for the coming decade. This Report is prepared as the TF09 "Astrophy…
Higgsino Dark Matter Confronts 14 years of Fermi Gamma Ray Data
Christopher Dessert, Joshua W. Foster, Yujin Park +2
Thermal higgsino dark matter (DM), with mass around 1 TeV, is a well-motivated, minimal DM scenario that arises in supersymmetric extensions of the Standard Model. Higgsinos may na…
Upper limit on the axion-photon coupling from magnetic white dwarf polarization
Christopher Dessert, David Dunsky, Benjamin R. Safdi
Polarization measurements of thermal radiation from magnetic white dwarf (MWD) stars have been proposed as a probe of axion-photon mixing. The radiation leaving the surface of the…
Red-Giant Branch Stellar Cores as Macroscopic Dark Matter Detectors
Christopher Dessert, Zachary Johnson
We show that macroscopic dark matter (DM) impacts on the degenerate helium cores of red-giant branch (RGB) stars can ignite helium fusion via DM-baryon elastic scattering. The onse…
Upper Limit on the QCD Axion Mass from Isolated Neutron Star Cooling
Malte Buschmann, Christopher Dessert, Joshua W. Foster +2
The quantum chromodynamics (QCD) axion may modify the cooling rates of neutron stars (NSs). The axions are produced within the NS cores from nucleon bremsstrahlung and, when the nu…
No evidence for axions from Chandra observation of magnetic white dwarf
Christopher Dessert, Andrew J. Long, Benjamin R. Safdi
Ultralight axions with axion-photon couplings GeV may resolve a number of astrophysical anomalies, such as unexpected ~TeV transpare…
X-ray Searches for Axions from Super Star Clusters
Christopher Dessert, Joshua W. Foster, Benjamin R. Safdi
Axions may be produced in abundance inside stellar cores and then convert into observable X-rays in the Galactic magnetic fields. We focus on the Quintuplet and Westerlund 1 super…
Systematics in the XENON1T data: the 15-keV anti-axion
Christopher Dessert, Joshua W. Foster, Yonatan Kahn +1
The XENON1T collaboration has found an excess of electron recoil events in their Science Run 1 data below ~7 keV with a spectral shape consistent with that expected from a solar-ax…
Axion Emission Can Explain a New Hard -ray Excess from Nearby Isolated Neutron Stars
Malte Buschmann, Raymond T. Co, Christopher Dessert +1
Axions may be produced thermally inside the cores of neutron stars (NSs), escape the stars due to their feeble interactions with matter, and subsequently convert into X-rays in the…
X-ray Signatures of Axion Conversion in Magnetic White Dwarf Stars
Christopher Dessert, Andrew J. Long, Benjamin R. Safdi
White dwarf (WD) stars may radiate keV-energy axions produced in their stellar cores. This has been extensively studied as an extra channel by which WDs may cool, with some analyse…
Addressing Astrophysical and Cosmological Problems With Secretly Asymmetric Dark Matter
Christopher Dessert, Can Kilic, Cynthia Trendafilova +1
We present a simple model of dark matter that can address astrophysical and cosmological puzzles across a wide range of scales. The model is an application of the Secretly Asymmetr…