Bahar Nikbakht

Department of Physics, Sharif University of Technology

Cosmic Inflation with Random Step-like Potentials and  Primordial Black Holes 

Supervisor: Ali Akbar Abolhasani 

Abstract: Recent observations of gravitational waves by the LIGO collaboration have returned attention to primordial black holes (PBHs). PBHs are also considered as candidates for dark matter. Furthermore, to be valid candidates, they must have extended mass distributions (EMD).

In this talk, we will show that modulation of the slow-roll potential with the local, sharp, and step-like noise can naturally produce primordial black holes in EMD. We first go to the long wavelength/low energy modes and show that some of these modes resonate with the noise, and hence their power spectrum is enhanced. Then we go to short wavelength/highly oscillating modes and define a correlation length for the stairs using them.

Finally, we calculate the probability of having at least two bursts of PBH for an arbitrary potential and show that this model may successfully explain the observations.

یکشنبه 27 شهریور 1401، ساعت 18:30

Sunday 18 September 2022 – 18:30 Tehran Time

تالار جناب  – آمفی تئاتر دانشکده فیزیک