# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Dark matter and dark radiation from primordial black holes

26 Jul 2021, 10:20
20m
Zoom

#### Zoom

Parallel session talk Dark Matter

### Speaker

Jérémy Auffinger (Institut de Physique des 2 Infinis - Lyon - FRANCE)

### Description

Primordial black holes (PBHs) lighter than $10^9\,$g are at present mostly unconstrained, because they evaporate before Big Bang Nucleosynthesis (BBN). Hence, they can not represent a fraction of dark matter (DM). However, their evaporation products can leave an imprint on the early universe observables. In this talk, we will decribe how the public code BlackHawk has been adapted to compute the Hawking radiation of light PBHs with the addition of a dark sector particle. Depending on this particle mass, it can result in a contribution to warm DM or dark radiation. The first one is further constrained using structure formation thanks to CLASS and the second one contributes to $\Delta N_\text{eff}$, constrained by BBN and CMB (future) experiments. We conclude by giving the Hawking radiation constraints on light PBHs.

Collaboration / Activity PhD student j.auffinger@ipnl.in2p3.fr Jérémy Auffinger

### Primary author

Jérémy Auffinger (Institut de Physique des 2 Infinis - Lyon - FRANCE)

### Co-authors

Alexandre Arbey (Institut de physique des deux infinis, Lyon, France) Isabella Masina (Ferrara University and INFN) Giorgio Orlando (University of Groningen) Kuver Sinha (University of Oklahoma) Pearl Sandick (University of Utah) Barmak Shams Es Haghi (University of Utah)