Gravitational perturbations from oscillons and transients after inflation
Abstract
We study the scalar and tensor perturbations generated by the fragmentation of the inflaton condensate into oscillons or transients after inflation, using nonlinear classical lattice simulations. Without including the backreaction of metric perturbations, we find that the magnitude of scalar metric perturbations never exceeds a few ×10-3, whereas the maximal strength of the gravitational wave signal today is $O$(10-9) for standard post-inflationary expansion histories. We provide parameter scalings for the α-attractor models of inflation, which can be easily applied to other models. We also discuss the likelihood of primordial black hole formation, as well as conditions under which the gravitational wave signal can be at observationally interesting frequencies and amplitudes. Finally, we provide an upper bound on the frequency of the peak of the gravitational wave signal, which applies to all preheating scenarios.
- Authors:
-
- Max Planck Inst. for Astrophysics (Germany)
- Rice Univ., Houston, TX (United States)
- Publication Date:
- Research Org.:
- Rice Univ., Houston, TX (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1594811
- Alternate Identifier(s):
- OSTI ID: 1546220
- Grant/Contract Number:
- SC0018216
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 12; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Classical solutions in field theory; Cosmology; Gravitational waves; Inflation; Nonlinear Dynamics; Particles & Fields; Gravitation, Cosmology & Astrophysics
Citation Formats
Lozanov, Kaloian D., and Amin, Mustafa A. Gravitational perturbations from oscillons and transients after inflation. United States: N. p., 2019.
Web. doi:10.1103/PhysRevD.99.123504.
Lozanov, Kaloian D., & Amin, Mustafa A. Gravitational perturbations from oscillons and transients after inflation. United States. doi:https://doi.org/10.1103/PhysRevD.99.123504
Lozanov, Kaloian D., and Amin, Mustafa A. Thu .
"Gravitational perturbations from oscillons and transients after inflation". United States. doi:https://doi.org/10.1103/PhysRevD.99.123504. https://www.osti.gov/servlets/purl/1594811.
@article{osti_1594811,
title = {Gravitational perturbations from oscillons and transients after inflation},
author = {Lozanov, Kaloian D. and Amin, Mustafa A.},
abstractNote = {We study the scalar and tensor perturbations generated by the fragmentation of the inflaton condensate into oscillons or transients after inflation, using nonlinear classical lattice simulations. Without including the backreaction of metric perturbations, we find that the magnitude of scalar metric perturbations never exceeds a few ×10-3, whereas the maximal strength of the gravitational wave signal today is $O$(10-9) for standard post-inflationary expansion histories. We provide parameter scalings for the α-attractor models of inflation, which can be easily applied to other models. We also discuss the likelihood of primordial black hole formation, as well as conditions under which the gravitational wave signal can be at observationally interesting frequencies and amplitudes. Finally, we provide an upper bound on the frequency of the peak of the gravitational wave signal, which applies to all preheating scenarios.},
doi = {10.1103/PhysRevD.99.123504},
journal = {Physical Review D},
number = 12,
volume = 99,
place = {United States},
year = {2019},
month = {6}
}
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