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ID: 403583.0, MPI für Gravitationsphysik / Observational Relativity and Cosmology
Stochastic gravity-wave background in inflationary-universe models
Authors:Allen, Bruce
Date of Publication (YYYY-MM-DD):1987-12
Title of Journal:Physical Review D
Volume:37
Issue / Number:8
Start Page:2078
End Page:2085
Review Status:not specified
Audience:Not Specified
Abstract / Description:The gravitational-wave-noise power spectrum P(ω) is found for a simple cosmological model with an ‘‘inflationary’’ early stage of expansion. The source of the gravitational-wave noise is quantum fluctuations during the inflationary de Sitter stage, which are amplified by the subsequent expansion of the Universe. The resulting spectrum P(ω) is compared to a naive estimate: a thermal spectrum at the (appropriately red-shifted) Gibbons-Hawking temperature. The two spectra are remarkably different. Unlike the thermal spectrum, P(ω) increases at low frequencies. We show that the source of the corresponding long-wavelength perturbations is a global gravitational instability during the inflationary de Sitter stage of expansion. An interesting consequence of the low-frequency behavior of P(ω) is that gravitational radiation contributes a constant fraction of the energy density of the Universe, even after the time of matter domination.
External Publication Status:published
Document Type:Article
Communicated by:Bruce Allen
Affiliations:MPI für Gravitationsphysik/Teilinstitut Hannover
MPI für Gravitationsphysik/Observational Relativity and Cosmology
External Affiliations:Department of Physics and Astronomy, Tufts University, Melford, MA 02155, USA
Identifiers:ISSN:1550-7998
DOI:10.1103/PhysRevD.37.2078
URL:http://link.aps.org/doi/10.1103/PhysRevD.37.2078
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