273 citations · 2k across the 28 of their papers we have counts for
29 papers
High-Frequency Gravitational Wave Search with ABRACADABRA-10\,cm
Kaliroë M. W. Pappas, Jessica T. Fry, Sabrina Cheng +12
High-frequency gravitational waves (HFGWs), above 10 kHz, promise a clean probe of new physics, largely free of the astrophysical backgrounds that complicate lower-frequency search…
Axion mass prediction from adaptive mesh refinement cosmological lattice simulations
Joshua N. Benabou, Malte Buschmann, Joshua W. Foster +1
The quantum chromodynamics (QCD) axion arises as the pseudo-Goldstone mode of a spontaneously broken abelian Peccei-Quinn (PQ) symmetry. If the scale of PQ symmetry breaking occurs…
Was There a 3.5 keV Line?
Christopher Dessert, Joshua W. Foster, Yujin Park +1
The 3.5 keV line is a purported emission line observed in galaxies, galaxy clusters, and the Milky Way whose origin is inconsistent with known atomic transitions and has previously…
A Search for Dark Matter Lines at the Galactic Center with 14 Years of Fermi Data
Joshua W. Foster, Yujin Park, Benjamin R. Safdi +2
Dark matter (DM) in the Milky Way halo may annihilate or decay to photons, producing monochromatic gamma rays. We search for DM-induced spectral lines using 14 years of data from t…
Detecting axion dark matter beyond the magnetoquasistatic approximation
Joshua N. Benabou, Joshua W. Foster, Yonatan Kahn +2
A number of proposals have been put forward for detecting axion dark matter (DM) with grand unification scale decay constants that rely on the conversion of coherent DM axions to o…
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…
Dark Grand Unification in the Axiverse: Decaying Axion Dark Matter and Spontaneous Baryogenesis
Joshua W. Foster, Soubhik Kumar, Benjamin R. Safdi +1
The quantum chromodynamics axion with a decay constant near the Grand Unification (GUT) scale has an ultralight mass near a neV. We show, however, that axion-like particles with ma…
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…
Introducing DMRadio-GUT, a search for GUT-scale QCD axions
L. Brouwer, S. Chaudhuri, H. -M. Cho +29
The QCD axion is a leading dark matter candidate that emerges as part of the solution to the strong CP problem in the Standard Model. The coupling of the axion to photons is the mo…
Axion Dark Matter
C. B. Adams, N. Aggarwal, A. Agrawal +152
Axions are well-motivated dark matter candidates with simple cosmological production mechanisms. They were originally introduced to solve the strong CP problem, but also arise in a…
Dark Matter In Extreme Astrophysical Environments
Masha Baryakhtar, Regina Caputo, Djuna Croon +37
Exploring dark matter via observations of extreme astrophysical environments -- defined here as heavy compact objects such as white dwarfs, neutron stars, and black holes, as well…
Extraterrestrial Axion Search with the Breakthrough Listen Galactic Center Survey
Joshua W. Foster, Samuel J. Witte, Matthew Lawson +4
Axion dark matter (DM) may efficiently convert to photons in the magnetospheres of neutron stars (NSs), producing nearly monochromatic radio emission. This process is resonantly tr…
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…
Dark Matter from Axion Strings with Adaptive Mesh Refinement
Malte Buschmann, Joshua W. Foster, Anson Hook +4
Axions are hypothetical particles that may explain the observed dark matter (DM) density and the non-observation of a neutron electric dipole moment. An increasing number of axion…
The search for low-mass axion dark matter with ABRACADABRA-10cm
Chiara P. Salemi, Joshua W. Foster, Jonathan L. Ouellet +10
Two of the most pressing questions in physics are the microscopic nature of the dark matter that comprises 84% of the mass in the universe and the absence of a neutron electric dip…
A deep search for decaying dark matter with XMM-Newton blank-sky observations
Joshua W. Foster, Marius Kongsore, Christopher Dessert +4
Sterile neutrinos with masses in the keV range are well-motivated extensions to the Standard Model that could explain the observed neutrino masses while also making up the dark mat…
Dark Matter Interferometry
Joshua W. Foster, Yonatan Kahn, Rachel Nguyen +2
The next generation of ultralight dark matter (DM) direct detection experiments, which could confirm sub-eV bosons as the dominant source of DM, will feature multiple detectors ope…
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…
Green Bank and Effelsberg Radio Telescope Searches for Axion Dark Matter Conversion in Neutron Star Magnetospheres
Joshua W. Foster, Yonatan Kahn, Oscar Macias +6
Axion dark matter (DM) may convert to radio-frequency electromagnetic radiation in the strong magnetic fields around neutron stars. The radio signature of such a process would be a…
Hard X-ray Excess from the Magnificent Seven Neutron Stars
Christopher Dessert, Joshua W. Foster, Benjamin R. Safdi
We report significant hard X-ray excesses in the energy range 2-8 keV for two nearby isolated neutron stars RX J1856.6-3754 and RX J0420.0-5022. These neutron stars have previously…
Early-Universe Simulations of the Cosmological Axion
Malte Buschmann, Joshua W. Foster, Benjamin R. Safdi
Ultracompact dark matter (DM) minihalos at masses at and below arise in axion DM models where the Peccei-Quinn (PQ) symmetry is broken after inflation. The min…
Design and Implementation of the ABRACADABRA-10 cm Axion Dark Matter Search
Jonathan L. Ouellet, Chiara P. Salemi, Joshua W. Foster +12
The past few years have seen a renewed interest in the search for light particle dark matter. ABRACADABRA is a new experimental program to search for axion dark matter over a broad…
First Results from ABRACADABRA-10 cm: A Search for Sub-eV Axion Dark Matter
Jonathan L. Ouellet, Chiara P. Salemi, Joshua W. Foster +12
The axion is a promising dark matter candidate, which was originally proposed to solve the strong-CP problem in particle physics. To date, the available parameter space for axion a…