[astroseminar at Sapienza] 18/10/2017 at 16:00: Ilia Musco

[Elia Battistelli]

Title: Primordial Black hole formation
Speaker: Ilia Musco
Institute: Laboratoire Univers et Théories (LUTH), Observatoire de 
Paris
Date: Wednesday, 18 October 2017
Time: 4:00pm
Location: Aula Conversi, Marconi Building, Dept. of Physics, Sapienza 
University


LECTURE (4:00pm): Gravitational Collapse
Abstract: In this lecture I will give a review of the gravitational 
collapse mechanism in
relativistic hydrodynamics assuming spherical symmetry, presenting the 
set of non linear
Einstein/fluid equations that need to be solved, focusing on perfect 
fluids. The equation of
state plays an important role to determine the outcome of the collapse. 
I will then discuss
the concept of space time foliation presenting the set of equations in 
two specific cases:
the Misner-Sharp comoving observer (cosmic time) and the 
Misner-Hernandez null
observer (observer time). The observer time foliation is particularly 
relevant for studying
black hole formation, following the complete evolution of the black 
hole exterior. I will
conclude introducing the concept of dynamical horizons for black holes 
in spherical
symmetry, generalizing the well known Schwarzschild condition R = 2M 
for the event
horizon.

SEMINAR (5:00pm): Primordial Black Hole Formation
Abstract: In the first part I will review the mechanism of 
gravitational collapse in
relativistic hydrodynamics assuming spherical symmetry, focusing on 
perfect fluids. With
the aim of studying black hole formation in different contexts, I will 
introduce the concept of
dynamical horizons, generalizing the Schwarzschild condition R = 2M for 
the event
horizon. In the second part I will present my results on primordial 
black hole formation,
using a Lagrangian relativistic hydrodynamical code to study the 
collapse of cosmological
perturbations in the early universe. They are interesting candidates 
for the dark matter
component of the Universe as well as for the seeds of supermassive 
black holes that we
observe today in the centres of galaxies.

web: https://agenda.infn.it/conferenceDisplay.py?confId=14282
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