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Formation of trapped vacuum bubbles during inflation, and consequences for PBH scenarios
Albert Escrivà, Vicente Atal, Jaume Garriga
A class of inflationary scenarios for primordial black hole (PBH) formation include a small barrier in the slope of the potential. There, the inflaton slows down, generating an enh…
PBH in single field inflation: the effect of shape dispersion and non-Gaussianities
Vicente Atal, Judith Cid, Albert Escrivà +1
Primordial black holes (PBHs) may result from high peaks in a random field of cosmological perturbations. In single field inflationary models, such perturbations can be seeded as t…
Enhanced cosmological perturbations and the merger rate of PBH binaries
Jaume Garriga, Nikolaos Triantafyllou
The rate of merger events observed by LIGO/Virgo can be used in order to probe the fraction of dark mater in the form of Primordial Black Holes. Here, we consider the merger ra…
Primordial black hole formation with non-Gaussian curvature perturbations
Vicente Atal, Jaume Garriga, Airam Marcos-Caballero
In the context of transient constant-roll inflation near a local maximum, we derive the non-perturbative field redefinition that relates a Gaussian random field with the true non-G…
PBH abundance from random Gaussian curvature perturbations and a local density threshold
Chul-Moon Yoo, Tomohiro Harada, Jaume Garriga +1
The production rate of primordial black holes is often calculated by considering a nearly Gaussian distribution of cosmological perturbations, and assuming that black holes will fo…
Primordial Perturbations in Einstein-Aether and BPSH Theories
Cristian Armendariz-Picon, Noela Farina Sierra, Jaume Garriga
We study the primordial perturbations generated during a stage of single-field inflation in Einstein-aether theories. Quantum fluctuations of the inflaton and aether fields seed lo…