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arXiv:0711.4326 (astro-ph)
[Submitted on 27 Nov 2007 (v1), last revised 14 Apr 2008 (this version, v4)]

Title:Inflation in DBI models with constant gamma

Authors:Michal Spalinski
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Abstract: Dirac-Born-Infeld scalar field theories which appear in the context of inflation in string theory in general have a field dependent speed of sound. It is however possible to write down DBI models which possess exact solutions characterized by a constant speed of sound different from unity. This requires that the potential and the effective D-brane tension appearing in a DBI action have to be related in a specific way. This paper describes such models in general and presents some examples with a constant speed of sound $c_s<1$ for which the spectrum of scalar perturbations can be found analytically without resorting to the slow roll approximation.
Comments: V3: Extended and improved discussion, some new results, and additional references. V4: small improvements; same as the version published in JCAP
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0711.4326 [astro-ph]
  (or arXiv:0711.4326v4 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0711.4326
Journal reference: JCAP 0804:002,2008
Related DOI: https://doi.org/10.1088/1475-7516/2008/04/002

Submission history

From: Michał Spaliński [view email]
[v1] Tue, 27 Nov 2007 18:45:07 UTC (10 KB)
[v2] Wed, 2 Jan 2008 15:44:36 UTC (11 KB)
[v3] Tue, 11 Mar 2008 13:22:28 UTC (15 KB)
[v4] Mon, 14 Apr 2008 11:19:50 UTC (15 KB)
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