124 citations · 517 across the 20 of their papers we have counts for
21 papers
Close Pulsar Pairs See Dark Matter Substructure through the Gravitational-Wave Background
Abhiram Cherukupalli, Vincent S. H. Lee, Kim V. Berghaus +1
Pulsar timing arrays detect signals from dark matter substructure, but a nanohertz gravitational-wave background (GWB) severely degrades their sensitivity. We show that timing puls…
Pulsar Timing Sensitivity to Dark Matter Substructure in the Presence of a Stochastic Gravitational-Wave Background
Abhiram Cherukupalli, Vincent S. H. Lee, Kim Berghaus +1
Pulsar timing arrays (PTAs) can detect dark matter (DM) substructure through the small shifts a transiting DM subhalo imprints on pulse arrival times. Recently found evidence for a…
The Migdal effect in Semiconductors for the Effective Field Theory of Dark Matter Direct Detection
Kim V. Berghaus, Rouven Essig, Megan H. McDuffie
The Migdal effect in semiconductors, prompt ionization from a primary nuclear scattering event, can be described across all kinematic regimes using an effective field theory that e…
Classical equipartition dynamics between axions and non-Abelian gauge fields
Kim V. Berghaus, Adrien Florio, M. Laine +1
Motivated by axion-like inflation and its warm embedding within the Standard Model, we study the early stages of the energy transfer between an axion condensate and an SU(2) gauge…
Physics beyond the Standard Model with the DSA-2000
Kim V. Berghaus, Yufeng Du, Vincent S. H. Lee +4
The upcoming Deep Synoptic Array 2000 (DSA-2000) will map the radio sky at GHz (eV) with unprecedented sensitivity. This will enable searches for dark matte…
Warm Inflation with the Standard Model
Kim V. Berghaus, Marco Drewes, Sebastian Zell
We show for the first time that warm inflation is feasible with Standard Model (SM) gauge interactions alone. Our model consists of a minimal extension of the SM by a single scalar…
Searching For Superheavy Decaying Particles With Ultra-High-Energy Neutrino Observatories
Kim V. Berghaus, Dan Hooper, Emily R. Simon
If there exist unstable but long-lived relics of the early universe, their decays could produce detectable fluxes of gamma rays and neutrinos. In this paper, we point out that the…
Quantifying Scalar Field Dynamics with DESI 2024 Y1 BAO measurements
Kim V. Berghaus, Joshua A. Kable, Vivian Miranda
Quintessence scalar fields are a natural candidate for evolving dark energy. Unlike the phenomenological parameterization of the dark energy equation of state, they cannot…
Warm inflation with a heavy QCD axion
Kim V. Berghaus, Matthew Forslund, Mark Vincent Guevarra
We propose the first model of warm inflation in which the particle production emerges directly from coupling the inflaton to Standard Model particles. Warm inflation, an early epoc…
The Cosmology of Dark Energy Radiation
Kim V. Berghaus, Tanvi Karwal, Vivian Miranda +1
In this work, we quantify the cosmological signatures of dark energy radiation -- a novel description of dark energy, which proposes that the dynamical component of dark energy is…
The Migdal Effect in Semiconductors for Dark Matter with Masses below 100 MeV
Kim V. Berghaus, Angelo Esposito, Rouven Essig +1
Dark matter scattering off a nucleus has a small probability of inducing an observable ionization through the inelastic excitation of an electron, called the Migdal effect. We use…
TF08 Snowmass Report: BSM Model Building
Patrick J. Fox, Graham D. Kribs, Hitoshi Murayama +53
We summarize the state of Beyond the Standard Model (BSM) model building in particle physics for Snowmass 2021, focusing mainly on several whitepaper contributions to BSM model bui…
Impact of freeze-in on dark matter isocurvature
Nicola Bellomo, Kim V. Berghaus, Kimberly K. Boddy
Dark matter freeze-in is a compelling cosmological production mechanism in which all or some of the observed abundance of dark matter is generated through feeble interactions it ha…
Thermal Friction as a Solution to the Hubble and Large-Scale Structure Tensions
Kim V. Berghaus, Tanvi Karwal
Thermal friction offers a promising solution to the Hubble and the large-scale structure (LSS) tensions. This additional friction acts on a scalar field in the early universe and e…
Some open questions in axion theory
Prateek Agrawal, Kim V. Berghaus, JiJi Fan +3
This white paper collects some open questions in several different aspects of axion theories. The questions are related to quantization of axion couplings, axion-magnetic monopole…
Snowmass2021 Cosmic Frontier: The landscape of low-threshold dark matter direct detection in the next decade
Rouven Essig, Graham K. Giovanetti, Noah Kurinsky +90
The search for particle-like dark matter with meV-to-GeV masses has developed rapidly in the past few years. We summarize the science case for these searches, the recent progress,…
The Phonon Background from Gamma Rays in Sub-GeV Dark Matter Detectors
Kim V. Berghaus, Rouven Essig, Yonit Hochberg +2
High-energy photons with (MeV) energies from radioactive contaminants can scatter in a solid-state target material and constitute an important low-energy background fo…
Dark Energy Radiation
Kim V. Berghaus, Peter W. Graham, David E. Kaplan +2
We show that if dark energy evolves in time, its dynamical component could be dominated by a bath of dark radiation. Within current constraints this radiation could have up to $\si…
Thermal Friction as a Solution to the Hubble Tension
Kim V. Berghaus, Tanvi Karwal
A new component added to the standard model of cosmology that behaves like a cosmological constant at early times and then dilutes away as radiation or faster can resolve the Hubbl…
Minimal Warm Inflation
Kim V. Berghaus, Peter W. Graham, David E. Kaplan
Slow-roll inflation is a successful paradigm. However we find that even a small coupling of the inflaton to other light fields can dramatically alter the dynamics and predictions o…
Decays of Long-Lived Relics and Their Signatures at IceCube
Kim V. Berghaus, Melissa D. Diamond, D. E. Kaplan
We consider long-lived relic particles as the source of the PeV-scale neutrinos detected at the IceCube observatory over the last six years. We derive the present day neutrino flux…