May 27 – 31, 2024
UB Physics Faculty
Europe/Madrid timezone

Baryon asymmetry, gravitational waves and non-Gaussianities from primordial black hole formation [Chair: Fumagalli]

May 30, 2024, 12:00 PM
Room N06 (UB Physics Faculty)

Room N06

UB Physics Faculty

Martí i Franquès, 1, 11 08028 Barcelona


Julian Rey (DESY)


We consider black hole formation due to the gravitational collapse produced by large density fluctuations generated during inflation. We show that non-Gaussian tails in the probability density function of curvature perturbations arise in these models from the delta N formalism, without resorting to stochastic inflation. Assuming the black holes form during an epoch of reheating with a stiff equation of state, we calculate the induced gravitational wave spectrum and constrain the parameter space by considering existing bounds on the total energy density of gravitational waves today. Finally, we calculate the lepton asymmetry generated by metric perturbations via the chiral gravitational anomaly and find that the large spectrum of scalar perturbations responsible for black hole formation induces a peak in the baryon asymmetry fluctuations on small scales.

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