IPM Calendar 
Tuesday 24 November 2020   Today  
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. ...