11 papers
Sterile Neutrino Dark Matter as a Probe of Inflationary Reheating
James M. Cline, Yong Xu
Sterile neutrinos offer a minimal and testable explanation for dark matter (DM), with their radiative decay actively searched for in X-ray observations. We show that cold sterile n…
Irreducible Graviton Floor from Reheating
James M. Cline, Yong Xu
Inflaton decay inevitably emits gravitons through bremsstrahlung during reheating. We show that the soft part of this emission amplitude, fixed by Weinberg's soft-graviton theorem,…
Probing Bose-enhanced Inflaton Decay with Gravitational Waves
Nicolás Bernal, Quan-feng Wu, Xun-Jie Xu +1
We investigate cosmic reheating dynamics in the presence of a transient condensate formed by bosonic decay products of the inflaton. We show that the emergence of such a condensate…
Modular invariant inflation and reheating
Gui-Jun Ding, Si-Yi Jiang, Yong Xu +1
We use modular symmetry as an organizing principle that attempts to simultaneously address the lepton flavor puzzle, inflation, and post-inflationary reheating. We demonstrate this…
Pre-thermalized Gravitational Waves
Nicolás Bernal, Quan-feng Wu, Xun-Jie Xu +1
We investigate a novel gravitational wave (GW) production mechanism from gravitons generated during the pre-thermal phase of cosmic reheating, where the energy density is dominated…
Probing Gravitational Dark Matter with Ultra-high Frequency Gravitational Waves
Yong Xu
The evidence for the existence of dark matter (DM) is compelling, yet its nature remains elusive. A minimal scenario involves DM interacting solely through gravity. However, the de…