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Extra Radiation Cosmologies: Implications of the Hubble Tension for eV-scale Neutrinos
Helena García Escudero, Kevork N. Abazajian
We present a new analysis on sterile neutrino cosmologies using the Dark Energy Spectroscopic Instrument (DESI) second data release (DR2) baryon acoustic oscillation (BAO) measurem…
Cosmic Structure Strikes Back: The Elimination of Vector-Mediated Nonstandard Interaction Models as a Mechanism for Sterile Neutrino Dark Matter Production
Cannon M. Vogel, Helena García Escudero, Kevork N. Abazajian
We revisit sterile-neutrino production enabled by nonstandard interactions (NSI) among active neutrinos mediated by new bosons. We focus on vector mediators, including neutrinophil…
Return of the Lepton Number: Sterile Neutrino Dark Matter Production and the Revival of the Shi-Fuller Mechanism
Cannon M. Vogel, Helena García Escudero, Julien Froustey +1
We explore resonant production of sterile neutrino dark matter via the Shi-Fuller (SF) mechanism, revisiting its cosmological viability in light of recent results demonstrating tha…
Visible in the laboratory and invisible in cosmology: decaying sterile neutrinos
Kevork N. Abazajian, Helena García Escudero
The expansion history and thermal physical process that happened in the early Universe before big bang nucleosynthesis (BBN) remains relatively unconstrained by observations. Low r…
Entering the Era of Measuring Sub-Galactic Dark Matter Structure: Accurate Transfer Functions for Axino, Gravitino & Sterile Neutrino Thermal Warm Dark Matter
Cannon M. Vogel, Kevork N. Abazajian
We examine thermal warm dark matter (WDM) models that are being probed by current constraints, and the relationship between the particle dark matter spin and commensurate thermal h…
Constraints on sterile neutrino models from strong gravitational lensing, Milky Way satellites, and Lyman- forest
Ioana A. Zelko, Tommaso Treu, Kevork N. Abazajian +5
The nature of dark matter is one of the most important unsolved questions in science. Some dark matter candidates do not have sufficient nongravitational interactions to be probed…