Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Albert Escrivà"'
Autor:
Albert Escrivà
Publikováno v:
Universe, Vol 8, Iss 2, p 66 (2022)
Primordial black holes, which could have been formed in the very early Universe due to the collapse of large curvature fluctuations, are currently one of the most attractive and fascinating research areas in cosmology for their possible theoretical a
Externí odkaz:
https://doaj.org/article/69dd9529b3784fe0b9c2c58575837ea1
Autor:
Albert Escrivà, Javier G. Subils
Publikováno v:
Physical Review D. 107
The final mass distribution of primordial black holes is sensitive to the equation of state of the Universe at the scales accessible by the power spectrum. Motivated by the presence of phase transitions in several beyond the Standard Model theories,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::29c0884585b81e4371229c40dd15f926
https://doi.org/10.1103/physrevd.107.l041301
https://doi.org/10.1103/physrevd.107.l041301
The probability of primordial black hole (PBH) formation is known to be boosted during the Quantum Chromodynamics (QCD) crossover due to a slight reduction of the equation of state. This induces a high peak and other features in the PBH mass distribu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2e0c538afaa707134b43f9c2c9c501a6
In this work, we have performed numerical simulations of primordial black hole (PBH) formation in the Friedman-Lema\^itre-Robertson-Walker universe filled by radiation fluid, introducing the local-type non-Gaussianity to the primordial curvature fluc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d64597fccb40bf334201c1cc7aa242ae
Autor:
Albert Escrivà, Antonio Enea Romano
We simulate numerically the formation of spherically symmetric primordial black holes (PBHs) seeded by different families of primordial curvature perturbations profiles on a Friedman-Robertson-Walker (FRW) Universe filled by radiation fluid. We have
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e75ab134b0a1f6fdf43564f236e65d5
http://arxiv.org/abs/2103.03867
http://arxiv.org/abs/2103.03867
Autor:
Albert Escrivà
Primordial black holes, which could have been formed in the very early Universe due to the collapse of large curvature fluctuations, are currently one of the most attractive and fascinating research areas in cosmology for their possible theoretical a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::59edd495c5930e7cf81b30ded90dd2e3
We consider black holes which form from an initially spherically symmetric super-Hubble perturbation of a cosmological background filled by a perfect fluid $p=w \rho$ with $w\in (0,1]$. Previous work has shown that when $w = 1/3$ (radiation), there i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fdbcc5b76b18be0d6bcf75a4a525f12c
Publikováno v:
Dipòsit Digital de la UB
Universidad de Barcelona
Universidad de Barcelona
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 the inflaton overshoots a small barrier on its way down the potential.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d2bdcb2c9488134e7205a50bdc4ee883
http://hdl.handle.net/2445/172614
http://hdl.handle.net/2445/172614
In this letter, we argue and show numerically that the threshold to form primordial black holes from an initial spherically symmetric perturbation is, to an excellent approximation, universal, whenever given in terms of the compaction function averag
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::639f0a0286e55cc59e2e1b415bf210d6
http://arxiv.org/abs/1907.13311
http://arxiv.org/abs/1907.13311
Autor:
Albert Escrivà
In this work we have used for the first time pseudo-spectral methods to perform numerical simulations of spherically symmetric black hole formations on a Friedman-Robertson-Walker universe. With these methods, the differential equations describing th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::328408a2bbfa76f368610a37d2d289bb
http://arxiv.org/abs/1907.13065
http://arxiv.org/abs/1907.13065