Ponente
Descripción
One of the most mysterious and abundant components of the current known universe is the so called Dark Matter. While we usually resort to physics beyond the Standard Model and new particles as possible explanations for it, we may not need to do so at all. Black Holes formed during or after inflation (thus "primordial") could end up being the majority of the Dark matter, thus solving the issue with already well known physics. After the discovery of gravitational waves by LIGO, there's been a lot of focus on Intermediate Mass Black Holes of more than 10 solar masses, and after various tests it is currently believed they could not make up more than 1% of the DM. However, as different experiments continue to probe these possibilities, one window in much smaller masses still remains. PBHs of masses around 1 pico solar mass are small enough to not have any noticeable dynamical effect, while their size makes most lensing experiments ineffective. Thus, they could still make up the entirety of DM. One of the few ways in which such a small objects could be probed would be in their capture by bigger astrophysical objects, in particular by main sequence stars. In this talk I will share specific results obtained when modelling this scenario, showcasing how in the early universe the capture of such objects would be pretty common. This would effect heavily the star formation history of the early universe and impact the population of extremely old stars. Existing and future searches in PoP III stars could thus constrain or confirm the leftover window.
