Belgian Cosmo Meeting

We hold an informal meeting during which new comers working in Cosmology will present their work and research topics. This takes place Wednesday 6th of October, seminar room E349 from 2pm to 6pm.

The program starts at 14:00 with Albert EscrivĂ  (ULB, Phys. Th.)

Formation of Primordial Black Holes

Primordial Black Holes (PBHs) could have been formed in the very early universe due to the collapse of large curvature fluctuations after inflation. PBHs are nowadays one of the most attractive and fascinating research areas in cosmology for their possible theoretical and observational implications. In this talk, I will review the physical process of PBH formation, and the numerical tools used to simulate them.

At 14:45, Pierre Auclair (UCLouvain, CURL) will talk about

Population of cosmic strings and gravitational waves

Cosmic strings are one-dimensional topological defects that could be formed during phase transitions in the primordial Universe. If formed, these relics would be markers of the upheavals of our early universe. During this talk, we will discuss about the evolution of the cosmic string network, in particular the density of loops and their gravitational wave emission. We will then make the connection with the future space-based LISA mission, and the results from LIGO/Virgo/KAGRA. If time permits, we will also show that the presence of cosmic strings may also affect other types of observables, such as the dark matter content of the Universe and the diffuse gamma-ray background.

After a break, at 16:00, Isabel Oldengott (UCLouvain, CP3) will be talking about

Local relic neutrino density with kinetic field theory

Kinetic field theory (KFT) is a statistical field theory for an ensemble of classical particles. It has quite recently been applied to large scale structure formation, showing a remarkable agreement to the results from N-body simulations. I am currently working on its application on the computation of the local relic neutrino density and will give a short review on the current status of the project.