187 citations · 535 across the 26 of their papers we have counts for
27 papers
Confronting the Higgsino Interpretation of the LZ Event with the High-Energy Sideband
Nicholas L. Rodd, Benjamin R. Safdi, Tracy R. Slatyer +1
The LZ experiment has reported a single 248 keV nuclear recoil event in their ton-yr exposure on a xenon target. The absence of lower nuclear recoil events is naturally expl…
Searches for electroweak states at future plasma wakefield colliders
So Chigusa, Simon Knapen, Toby Opferkuch +3
We quantify the discovery potential of future multi-TeV plasma wakefield colliders for new electroweak multiplets. We include beam-beam effects through realistic luminosity spectra…
Wino and Real Minimal Dark Matter Excluded by Fermi Gamma-Ray Observations
Benjamin R. Safdi, Weishuang Linda Xu
We show that minimal, fermionic dark matter (DM) models in the -dimensional representation of the weak force with zero hypercharge that make up 100% of the DM under the standard…
Discovering the Higgsino at CTAO-North within the Decade
Shotaro Abe, Tomohiro Inada, Emmanuel Moulin +3
We demonstrate that higgsino dark matter (DM) could be discovered within the next few years using the Cherenkov Telescope Array Observatory's soon-to-be-operational northern site (…
Design Initiative for a 10 TeV pCM Wakefield Collider
Spencer Gessner, Jens Osterhoff, Carl A. Lindstrøm +198
This document outlines a community-driven Design Study for a 10 TeV pCM Wakefield Accelerator Collider. The 2020 ESPP Report emphasized the need for Advanced Accelerator R\&D, and…
CTA and SWGO can Discover Higgsino Dark Matter Annihilation
Nicholas L. Rodd, Benjamin R. Safdi, Weishuang Linda Xu
Thermal higgsino dark matter (DM), with a mass near 1.1 TeV, is one of the most well-motivated and untested DM candidates. Leveraging recent hydrodynamic cosmological simulations t…
Scalar Co-SIMP Dark Matter: Models and Sensitivities
Aditya Parikh, Juri Smirnov, Weishuang Linda Xu +1
In this work, we present UV completions of the recently proposed number-changing Co-SIMP freeze-out mechanism. In contrast to the standard cannibalistic-type dark matter picture th…
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…
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…
The Inflated Chern-Simons Number in Spectator Chromo-Natural Inflation
Hengameh Bagherian, Matthew Reece, Weishuang Linda Xu
The chromo-natural inflation (CNI) scenario predicts a potentially detectable chiral gravitational wave signal, generated by a Chern-Simons coupling between a rolling scalar axion…
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…
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…
Cosmological Constraints on Light (but Massive) Relics
Weishuang Linda Xu, Julian B. Muñoz, Cora Dvorkin
Many scenarios of physics beyond the standard model predict new light, weakly coupled degrees of freedom, populated in the early universe and remaining as cosmic relics today. Due…
The Swapland
Prateek Agrawal, Hengameh Bagherian, Cari Cesarotti +6
All the news that's (un)fit to publish.
A Closer Look at CP-Violating Higgs Portal Dark Matter as a Candidate for the GCE
Katherine Fraser, Aditya Parikh, Weishuang Linda Xu
A statistically significant excess of gamma rays has been reported and robustly confirmed in the Galactic Center over the past decade. Large local dark matter densities suggest tha…
Accurately Weighing Neutrinos with Cosmological Surveys
Weishuang Linda Xu, Nicholas DePorzio, Julian B. Muñoz +1
A promising avenue to measure the total, and potentially individual, mass of neutrinos consists of leveraging cosmological datasets, such as the cosmic microwave background and sur…
Finding eV-scale Light Relics with Cosmological Observables
Nicholas DePorzio, Weishuang Linda Xu, Julian B. Muñoz +1
Cosmological data provide a powerful tool in the search for physics beyond the Standard Model (SM). An interesting target are light relics, new degrees of freedom which decoupled f…
Searching for Dark Photon Dark Matter with Cosmic Ray Antideuterons
Lisa Randall, Weishuang Linda Xu
Low energy antideuteron detection presents a unique channel for indirect detection, targeting dark matter that annihilates into hadrons in a relatively background-free way. Since t…
Testing CDM With Dwarf Galaxy Morphology
Weishuang Linda Xu, Lisa Randall
The leading tensions to the collisionless cold dark matter (CDM) paradigm are the "small-scale controversies", discrepancies between observations at the dwarf-galactic scale and th…
Inflation and Dark Energy from spectroscopy at
Simone Ferraro, Michael J. Wilson, Muntazir Abidi +140
The expansion of the Universe is understood to have accelerated during two epochs: in its very first moments during a period of Inflation and much more recently, at , when D…
Testing Gravity Using Type Ia Supernovae Discovered by Next-Generation Wide-Field Imaging Surveys
A. G. Kim, G. Aldering, P. Antilogus +29
In the upcoming decade cadenced wide-field imaging surveys will increase the number of identified Type~Ia supernovae (SNe~Ia) from the hundreds to the hundreds of thousands…
Primordial Non-Gaussianity
P. Daniel Meerburg, Daniel Green, Muntazir Abidi +175
Our current understanding of the Universe is established through the pristine measurements of structure in the cosmic microwave background (CMB) and the distribution and shapes of…
Messengers from the Early Universe: Cosmic Neutrinos and Other Light Relics
Daniel Green, Mustafa A. Amin, Joel Meyers +136
The hot dense environment of the early universe is known to have produced large numbers of baryons, photons, and neutrinos. These extreme conditions may have also produced other lo…