17 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…
Reheating in No-Scale Models of Inflation
Ignatios Antoniadis, John Ellis, Dimitri V. Nanopoulos +2
Analogously to the suppression of inflaton decays into conformally-coupled scalar fields in the original Starobinsky model of inflation, inflaton decays to Standard Model…
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…
Planck-Scale Effects on Nucleon Decay in Minimal Supersymmetric SU(5)
John Ellis, Jason L. Evans, Shihwen Hor +2
We examine the impact on the phenomenology of the minimal supersymmetric SU(5) Grand Unified Theory (GUT) of dimension-5 operators with coefficients suppressed by the Planck mass s…
Radiative Corrections in Supergravity Models of Inflation
John Ellis, Tony Gherghetta, Kunio Kaneta +2
Supergravity provides the natural supersymmetric framework for early universe cosmology. A broad class of inflationary models in no-scale supergravity yields tree-level predictions…
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…