Generating PBHs and small-scale GWs in two-field models of inflation

Autor: Alexei A. Starobinsky, Matteo Braglia, L. Sriramkumar, Dhiraj Kumar Hazra, Fabio Finelli, George F. Smoot
Přispěvatelé: Matteo Braglia, Dhiraj Kumar Hazra, Fabio Finelli, George F. Smoot, L. Sriramkumar, Alexei A. Starobinsky, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
High Energy Physics - Theory
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
inflation
primordial black holes
primordial gravitational waves (theory)
Scalar (mathematics)
Dark matter
FOS: Physical sciences
Primordial black hole
Astrophysics
General Relativity and Quantum Cosmology (gr-qc)
dark matter: density
Astrophysics::Cosmology and Extragalactic Astrophysics
isocurvature: perturbation
01 natural sciences
General Relativity and Quantum Cosmology
power spectrum: primordial
Pulsar
0103 physical sciences
Gravitational collapse
coupling: kinetic
pulsar
Inflation (cosmology)
Physics
perturbation: primordial
Einstein Telescope
010308 nuclear & particles physics
Gravitational wave
[PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th]
gravitational radiation: background
tachyon: stability
Astronomy and Astrophysics
inflation: model
background: stochastic
gravitation: collapse
perturbation: scalar
High Energy Physics - Theory (hep-th)
non-Gaussianity
[PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]
Einstein
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
black hole: primordial
Astrophysics - Cosmology and Nongalactic Astrophysics
Zdroj: JCAP
JCAP, 2020, 08, pp.001. ⟨10.1088/1475-7516/2020/08/001⟩
Journal of Cosmology and Astroparticle Physics
ISSN: 0264-9381
1475-7516
1126-6708
2041-8205
0004-637X
DOI: 10.1088/1475-7516/2020/08/001⟩
Popis: Primordial black holes (PBHs) generated by gravitational collapse of large primordial overdensities can be a fraction of the observed dark matter. In this paper, we introduce a mechanism to produce a large peak in the primordial power spectrum (PPS) in two-field inflationary models characterized by two stages of inflation based on a large non-canonical kinetic coupling. This mechanism is generic to several two-field inflationary models, due to a temporary tachyonic instability of the isocurvature perturbations at the transition between the two stages of inflation. We numerically compute the primordial perturbations from largest scales to the small scales corresponding to that of PBHs using an extension of BINGO (BI-spectra and Non-Gaussianity Operator). Moreover we numerically compute the stochastic background of gravitational waves (SBGW) produced by second order scalar perturbations within frequencies ranging from nano-Hz to KHz that covers the observational scales corresponding to Pulsar Timing Arrays, Square Kilometer Array to that of Einstein telescope. We discuss the prospect of its detection by these proposed and upcoming gravitational waves experiments.
Comment: 20 pages, 7 figures; v2 matches the version published on JCAP
Databáze: OpenAIRE
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