Primordial black holes as dark matter candidates

DIPC Seminars

Joaquin Sureda, DIPC
Hybrid Seminar, Donostia International Physics Center
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Primordial black holes as dark matter candidates Although many candidates have already been postulated to solve the Dark Matter (DM) problem, its true nature remains unclear. Primordial black holes (PBHs) are thought to be formed in the very early Universe by the collapse of energy density fluctuations or similar processes and have been proposed as feasible DM candidates. Nowadays, many observations rule out PBHs as DM because of the potential effects arising from their existence. However, most of the constraints that rule out PBHs as DM, are calculated considering that they have a single mass. During the last years, I studied the possibility of PBHs as DM considering extended mass distributions, using a modified Press- Schechter approach. I put constraints on the extended PBH mass function by developing a method for converting existing constraints on the PBH mass fraction, derived assuming monochromatic mass distributions for PBHs, into constraints applicable for extended ones. The most relevant results from this work are that there are regions in the parameter space where DM can be entirely composed of PBHs. Additionally, some of them are very interesting as they predict PBHs with masses close to the black hole masses detected by LIGO, which are difficult to explain only by stellar collapse. Host: Marcos Pellejero **Zoom:** **Youtube:**