| Friday 19 April 2024 | |
| Events for day: Tuesday 10 November 2020 |
| 14:00 - 15:00 Weekly Seminar HEPCo Group Primordial black holes and stochastic gravitational waves in the Sound Speed Resonance Cosmology School PHYSICS Abstract: The sound speed resonance (SSR) is a novel mechanism for primordial black hole (PBH) formation. During the inflationary stage of the very early Universe, the inflaton may undergo a special process with a nontrivial time-oscillating sound speed, leading to an exponential enhancement of comoving curvature perturbations around a characteristic scale, which is the so-called SSR mechanism. The consequent PBH formation could occur efficiently at this characteristic scale with a nearly monochromatic mass function, which would provide a reasonable candidate for dark matter and yield other cosmological and astrophysical implications. ... |