743 citations · 5.7k across the 86 of their papers we have counts for
18 papers · 1 filter
Axions and the RR Lyrae Period-Luminosity Relation
Jeremy Sakstein, Djuna Croon
We investigate the impact of axions on the period-luminosity relation (PLR) of RR Lyrae stars. During the red giant branch phase, emission through the electron coupling cools the c…
Millicharged Particle Constraints from Asymptotic Giant Branch Stars
Damiano F. G. Fiorillo, Giuseppe Lucente, Jeremy Sakstein +1
We investigate the effect of millicharged particles (MCPs) with electric charge and mass on the late-stage evolution phases of low-mass stars in globular clusters.…
Millicharged Particle Production During Late-Stage Stellar Evolution
Damiano F. G. Fiorillo, Giuseppe Lucente, Jeremy Sakstein +1
Stars are natural sources of feebly interacting particles, including putative particles with mass and electric charge . The emission of such millicharged particles (MCPs)…
The Black Hole Mass Gap as a New Probe of Millicharged Particles
Damiano F. G. Fiorillo, Giuseppe Lucente, Jeremy Sakstein +2
We investigate the impact of millicharged particles (MCPs) on massive stars undergoing pulsational pair-instability supernovae and on the location of the lower edge of the black ho…
Dark matter silences Cepheids in the Galactic Center
Djuna Croon, Tim Linden, Jeremy Sakstein
Upcoming near-infrared facilities (e.g. JWST/NIRCam, ELT/MICADO) will dramatically increase the detectability of galactic center Cepheids despite extreme extinction at optical wave…
Cosmology and Astrophysics of CP-Violating Axions
Omar F. Ramadan, Jeremy Sakstein, Djuna Croon
We study the cosmology and astrophysics of axion-like particles (ALPs) with CP-violating Yukawa couplings to nucleons. At finite nucleon density, the ALP's dynamics is governed by…
Dark Dwarfs: Dark Matter-Powered Sub-Stellar Objects Awaiting Discovery at the Galactic Center
Djuna Croon, Jeremy Sakstein, Juri Smirnov +1
We investigate the effects of dark matter annihilation on objects with masses close to the sub-stellar limit, finding that the minimum mass for stable hydrogen burning is larger th…
Tip of the Red Giant Branch Bounds on the Neutrino Magnetic Dipole Moment Revisited
Noah Franz, Mitchell Dennis, Jeremy Sakstein
We use a novel method to constrain the neutrino magnetic dipole moment () using the empirically-calibrated tip of the red giant branch I-band magnitude that fully accounts for…
Constraining the chameleon-photon coupling with atomic spectroscopy
Benjamin Elder, Jeremy Sakstein
We compute bounds from atomic spectroscopy on chameleon fields that couple to the photon. Chameleons are a wide class of scalar field models that generically lead to screened fifth…
Dark Matter-Induced Stellar Oscillations
Jeremy Sakstein, Ippocratis D. Saltas
It has been hypothesized that dark matter is comprised of ultra-light bosons whose collective phenomena can be described as a scalar field undergoing coherent oscillations. Example…
Impact of Simultaneous Stellar Modeling Uncertainties on the Tip of the Red Giant Branch for Axion-Election Coupling
Mitchell T. Dennis, Jeremy Sakstein
We present a novel method for incorporating the effects of stellar modeling uncertainties into constraints on the axion-electron coupling constant found using the observed calibrat…
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…
Axion Instability Supernovae
Jeremy Sakstein, Djuna Croon, Samuel D. McDermott
New particles coupled to the Standard Model can equilibrate in stellar cores if they are sufficiently heavy and strongly coupled. In this work, we investigate the astrophysical con…
Direct detection of dark energy: the XENON1T excess and future prospects
Sunny Vagnozzi, Luca Visinelli, Philippe Brax +2
We explore the prospects for direct detection of dark energy by current and upcoming terrestrial dark matter direct detection experiments. If dark energy is driven by a new light d…
Missing in Axion: where are XENON1T's big black holes?
Djuna Croon, Samuel D. McDermott, Jeremy Sakstein
We pioneer the black hole mass gap as a powerful new tool for constraining new particles. A new particle that couples to the Standard Model---such as an axion---acts as an addition…
Baryogenesis via Gravitational Spontaneous Symmetry Breaking
Qiuyue Liang, Jeremy Sakstein, Mark Trodden
We study baryogenesis in effective field theories where a -charged scalar couples to gravity via curvature invariants. We analyze the general possibilities in…
Baryogenesis in Lorentz-violating gravity theories
Jeremy Sakstein, Adam R. Solomon
Lorentz-violating theories of gravity typically contain constrained vector fields. We show that the lowest-order coupling of such vectors to -symmetric scalars can n…
Baryogenesis via Dark Matter-Induced Symmetry Breaking in the Early Universe
Jeremy Sakstein, Mark Trodden
We put forward a new proposal for generating the baryon asymmetry of the universe by making use of the dynamics of a scalar field coupled to dark matter. High dark…