Primordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld Inflation

We study Dirac-Born-Infeld (DBI) inflation models with multiple scalar fields. We show that the adiabatic and entropy modes propagate with a common effective sound speed and are thus amplified at the sound horizon crossing. In the small sound speed limit, we find that the amplitude of the entropy mo...

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Detalles Bibliográficos
Autores principales: Langlois, David, Renaux-Petel, Sebastien, Steer, Daniele A, Tanaka, Takahiro
Lenguaje:eng
Publicado: 2008
Materias:
Particle Physics - Theory
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.101.061301
http://cds.cern.ch/record/1100586
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author Langlois, David
Renaux-Petel, Sebastien
Steer, Daniele A
Tanaka, Takahiro
author_facet Langlois, David
Renaux-Petel, Sebastien
Steer, Daniele A
Tanaka, Takahiro
author_sort Langlois, David
collection CERN
description We study Dirac-Born-Infeld (DBI) inflation models with multiple scalar fields. We show that the adiabatic and entropy modes propagate with a common effective sound speed and are thus amplified at the sound horizon crossing. In the small sound speed limit, we find that the amplitude of the entropy modes is much higher than that of the adiabatic modes. We show that this could strongly affect the observable curvature power spectrum as well as the amplitude of non-Gaussianities, although their shape remains as in the single-field DBI case.
id cern-1100586
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2008
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spelling cern-11005862019-09-30T06:29:59Zdoi:10.1103/PhysRevLett.101.061301http://cds.cern.ch/record/1100586engLanglois, DavidRenaux-Petel, SebastienSteer, Daniele ATanaka, TakahiroPrimordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld InflationParticle Physics - TheoryWe study Dirac-Born-Infeld (DBI) inflation models with multiple scalar fields. We show that the adiabatic and entropy modes propagate with a common effective sound speed and are thus amplified at the sound horizon crossing. In the small sound speed limit, we find that the amplitude of the entropy modes is much higher than that of the adiabatic modes. We show that this could strongly affect the observable curvature power spectrum as well as the amplitude of non-Gaussianities, although their shape remains as in the single-field DBI case.arXiv:0804.3139CERN-PH-TH-2008-077oai:cds.cern.ch:11005862008-04-22
spellingShingle Particle Physics - Theory
Langlois, David
Renaux-Petel, Sebastien
Steer, Daniele A
Tanaka, Takahiro
Primordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld Inflation
title Primordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld Inflation
title_full Primordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld Inflation
title_fullStr Primordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld Inflation
title_full_unstemmed Primordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld Inflation
title_short Primordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld Inflation
title_sort primordial fluctuations and non-gaussianities in multifield dirac-born-infeld inflation
topic Particle Physics - Theory
url https://dx.doi.org/10.1103/PhysRevLett.101.061301
http://cds.cern.ch/record/1100586
work_keys_str_mv AT langloisdavid primordialfluctuationsandnongaussianitiesinmultifielddiracborninfeldinflation
AT renauxpetelsebastien primordialfluctuationsandnongaussianitiesinmultifielddiracborninfeldinflation
AT steerdanielea primordialfluctuationsandnongaussianitiesinmultifielddiracborninfeldinflation
AT tanakatakahiro primordialfluctuationsandnongaussianitiesinmultifielddiracborninfeldinflation

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