Primordial black holes are expected to form from large, but rare, cosmological fluctuations in the tail of the probability distribution arising from inflation. I will present how importance sampling can be used to efficiently investigate the far, numerically expensive, probability tail of these fluctuations, finding non-perturbative deviations from Gaussianity. This is done by solving the...
Axion-like inflation models have for long been discussed as the radiative corrections that spoil many single-field models are avoided by virtue of its shift symmetry. In addition, the inflaton can generically have an axion-like coupling to non-abelian gauge bosons. It has been shown that this interaction automatically induces a non-diluting thermal bath during inflation leading to a...
Primordial black holes can span a large range of masses depending on their time of formation. In particular, they can have subsolar masses and form binary systems in an efficient way. The inspiral phase can last for long periods of time (from hours to years) with a slow increase of frequency and, therefore, these signals are well suited to be searched with continuous gravitational waves...
We show that highly spinning primordial black holes of mass M ∼ 10^12 kg, potentially born in a matter-dominated era after inflation, can produce clouds of pions in their vicinity via the su- perradiant instability, with densities up to that of nuclear matter. We discuss the electromagnetic signatures of this process, via neutral pion decay and charged pion annihilation into photons, com-...
At the end of its evaporation, a black hole may leave a remnant where a large amount of information is stored. We argue that the existence of an area gap as predicted by loop quantum gravity removes a main objection to this scenario. Remnants should radiate in the low-frequency spectrum. We model this emission and derive properties of the diffuse radiation emitted by a population of such...
Understanding the non-linear evolution of Large Scale Structure (LSS) is a key challenge in contemporary cosmology. To this end, it is important to combine both numerical simulations and analytical approaches, such as perturbation theory of LSS. Recently, it has been understood that the power spectrum in a cold dark matter dominated Universe can be investigated via an expansion in inverse...
In this talk I will present my current research on primordial black holes in (4+1) dimensional models. I will discuss how black hole properties - such as temperature, accretion rate and evaporation - change when one introduces an extra dimension. We are currently studying how these changes affect the range of masses in the dark matter window (f_PBH~1) and other observational signatures.
