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Metric perturbations in dilaton-driven inflation
We compute the spectrum of scalar and tensor metric perturbations generated, as amplified vacuum fluctuations, during an epoch of dilaton-driven inflation of the type occurring naturally in string cosmology. In the tensor case the computation is straightforward while, in the scalar case, it is made...
Autores principales: | , , , , |
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Lenguaje: | eng |
Publicado: |
1995
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.51.6744 http://cds.cern.ch/record/275176 |
_version_ | 1780887439966994432 |
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author | Brustein, R. Gasperini, M. Giovannini, Massimo Mukhanov, Viatcheslav F. Veneziano, G. |
author_facet | Brustein, R. Gasperini, M. Giovannini, Massimo Mukhanov, Viatcheslav F. Veneziano, G. |
author_sort | Brustein, R. |
collection | CERN |
description | We compute the spectrum of scalar and tensor metric perturbations generated, as amplified vacuum fluctuations, during an epoch of dilaton-driven inflation of the type occurring naturally in string cosmology. In the tensor case the computation is straightforward while, in the scalar case, it is made delicate by the appearance of a growing mode in the familiar longitudinal gauge. In spite of this, a reliable perturbative calculation of perturbations far outside the horizon can be performed by resorting either to appropriate gauge invariant variables, or to a new coordinate system in which the growing mode can be ``gauged down". The simple outcome of this complicated analysis is that both scalar and tensor perturbations exhibit nearly Planckian spectra, whose common ``temperature" is related to some very basic parameters of the string-cosmology background. |
id | cern-275176 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 1995 |
record_format | invenio |
spelling | cern-2751762020-07-23T02:49:36Zdoi:10.1103/PhysRevD.51.6744http://cds.cern.ch/record/275176engBrustein, R.Gasperini, M.Giovannini, MassimoMukhanov, Viatcheslav F.Veneziano, G.Metric perturbations in dilaton-driven inflationParticle Physics - TheoryWe compute the spectrum of scalar and tensor metric perturbations generated, as amplified vacuum fluctuations, during an epoch of dilaton-driven inflation of the type occurring naturally in string cosmology. In the tensor case the computation is straightforward while, in the scalar case, it is made delicate by the appearance of a growing mode in the familiar longitudinal gauge. In spite of this, a reliable perturbative calculation of perturbations far outside the horizon can be performed by resorting either to appropriate gauge invariant variables, or to a new coordinate system in which the growing mode can be ``gauged down". The simple outcome of this complicated analysis is that both scalar and tensor perturbations exhibit nearly Planckian spectra, whose common ``temperature" is related to some very basic parameters of the string-cosmology background.We compute the spectrum of scalar and tensor metric perturbations generated, as amplified vacuum fluctuations, during an epoch of dilaton-driven inflation of the type occurring naturally in string cosmology. In the tensor case the computation is straightforward while, in the scalar case, it is made delicate by the appearance of a growing mode in the familiar longitudinal gauge. In spite of this, a reliable perturbative calculation of perturbations far outside the horizon can be performed by resorting either to appropriate gauge invariant variables, or to a new coordinate system in which the growing mode can be ``gauged down". The simple outcome of this complicated analysis is that both scalar and tensor perturbations exhibit nearly Planckian spectra, whose common ``temperature" is related to some very basic parameters of the string-cosmology background.hep-th/9501066CERN-TH-7544-94CERN-TH-7544-94oai:cds.cern.ch:2751761995-01-17 |
spellingShingle | Particle Physics - Theory Brustein, R. Gasperini, M. Giovannini, Massimo Mukhanov, Viatcheslav F. Veneziano, G. Metric perturbations in dilaton-driven inflation |
title | Metric perturbations in dilaton-driven inflation |
title_full | Metric perturbations in dilaton-driven inflation |
title_fullStr | Metric perturbations in dilaton-driven inflation |
title_full_unstemmed | Metric perturbations in dilaton-driven inflation |
title_short | Metric perturbations in dilaton-driven inflation |
title_sort | metric perturbations in dilaton-driven inflation |
topic | Particle Physics - Theory |
url | https://dx.doi.org/10.1103/PhysRevD.51.6744 http://cds.cern.ch/record/275176 |
work_keys_str_mv | AT brusteinr metricperturbationsindilatondriveninflation AT gasperinim metricperturbationsindilatondriveninflation AT giovanninimassimo metricperturbationsindilatondriveninflation AT mukhanovviatcheslavf metricperturbationsindilatondriveninflation AT venezianog metricperturbationsindilatondriveninflation |