1st TEONGRAV international workshop on theory of gravitational waves

Primordial Black Hole formation from a massless scalar field

17 Sept 2024, 10:10

20m

Physics Department - Aula Amaldi (Marconi Building) (Sapienza University of Rome)

Contributed Talks

Speaker

Dr Ilia Musco (Istituto Nazionale di Fisica Nucleare, Rome)

Description

Assuming spherical symmetry we consider primordial black hole formation from the collapse of adiabatic cosmological perturbations of a massless scalar field, sourced by a time independent curvature profile $\mathcal{R}(r)$ imposed on super horizon scale. We have proved that a massless scalar field is equivalent to a perfect fluid where the pressure is equal to the total energy density (i.e. $p=\rho$ equation of state ). Using the comoving and the constant mean curvature gauge we build up a numerical code based on the BSSN conformal decomposition, developed specifically for this problem, computing the threshold ${\delta }_c$ for different initial configurations. This will allow to compute the abundance and mass distribution of PBHs formed when the early Universe is dominated by massless scalar field.

Presentation materials

Musco Teongrav 2024.pdf