A5103006511- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
University of Michigan–Ann Arbor
2019-2023
Abstract We study for the first time possibility of probing long-range fifth forces utilizing asteroid astrometric data, via force-induced orbital precession. examine nine Near-Earth Object (NEO) asteroids whose trajectories are accurately determined optical and radar astrometry. Focusing on a Yukawa-type potential mediated by new gauge field (dark photon) or baryon-coupled scalar, we estimate sensitivity reach force coupling strength mediator mass in range m ≃ (10 -21 -10 -15 ) eV, near...
Dark matter annihilation might power the first luminous stars in Universe. These types of stars, known as dark could form $({10}^{6}--1{0}^{8})\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$ protohalos at redshifts $z\ensuremath{\sim}20$, and they be much more larger size than ordinary powered by nuclear fusion. We investigate formation self-interacting (SIDM) scenario. present a concrete particle physics model SIDM that can simultaneously give rise to observed density, satisfy constraints from...
Direct detection experiments have set increasingly stringent limits on the cross section for spin-independent dark matter-nucleon interactions. In obtaining such limits, primarily assume standard halo model (SHM) as distribution of matter in our Milky Way. Three astrophysical parameters are required to define SHM: local escape velocity, density and circular velocity sun around center galaxy. This paper studies effect uncertainties these three XENON1T exclusion using publicly available DDCalc...
In the currently favored cosmological paradigm galaxies form hierarchically through accretion of numerous satellite galaxies. Since satellites are much less massive than host halo, they occupy a small fraction volume in action space defined by potential halo. actions conserved when halo changes adiabatically, stars from an accreted expected to remain clustered as evolves. this paper, we identify three Milky Way like disk baryonic FIRE-2 simulations tracking simulation snapshots. We then try...