7 papers
Leptogenesis and Low Reheating Temperatures
Marcos A. G. Garcia, Stephen E. Henrich, Wenqi Ke +1
We study leptogenesis during non-instantaneous reheating in the canonical type-I seesaw framework, with the dominant source of right-handed neutrino (RHN) production being non-ther…
Gravitational ultra-relativistic freeze-out during general reheating
Mathieu Gross, Stephen E. Henrich, Fotis Koutroulis
We investigate ultrarelativistic freeze-out (UFO) in the context of generic reheating scenarios. While the standard WIMP dark matter paradigm has been extensively studied, UFO has…
Searching for UFOs from the early universe: direct detection prospects for relativistically decoupling dark matter
Stephen E. Henrich, Yann Mambrini, Keith A. Olive
Particles that decouple relativistically from the Standard Model bath during reheating represent a versatile class of well-motivated cold dark matter candidates. In fact, ultrarela…
Z' portal dark matter from post-inflationary reheating: WIMPs, FIMPs, and UFOs
Stephen E. Henrich, Yann Mambrini, Keith A. Olive
We investigate the production of dark matter (DM) via a heavy mediator during the post-inflationary reheating epoch. In particular, we study production from three mechanisms w…
Ultra-relativistic freeze-out: a bridge from WIMPs to FIMPs
Stephen E. Henrich, Yann Mambrini, Keith A. Olive
We re-examine the case for dark matter (DM) produced by ultra-relativistic freeze-out (UFO). UFO is the mechanism by which Standard Model (SM) neutrinos decouple from the radiation…
Ultra-Relativistic Freeze-Out During Reheating
Stephen E. Henrich, Mathieu Gross, Yann Mambrini +1
We perform a thorough investigation of (ultra)relativistic freeze-out (UFO) during reheating. While the standard WIMP (non-relativistic freeze-out) and FIMP (freeze-in) paradigms h…