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Inflation in string cosmology

Abstract : Cosmic inflation is responsible for the primordial density fluctuations which are the seeds of today's large-scale structures and which are observed through the temperature fluctuations of the Cosmic Microwave Background. In this thesis, we explore a particular model of inflation with modified kinetics : Dirac-Born-Infeld (DBI) inflation inspired by string theory. In this scenario, inflation is generated by the motion of a probe brane and particles can be created during inflation when trapped branes are present along the inflationary valley. We will show that such a coupling between the inflaton and matter fields leads to interesting features in the primordial power spectrum, similar to features à la Starobinsky sourced by the potential or scalar-tensor features sourced by a suddenly-varying inflaton-matter coupling function in k-inflation. We will insist on the possible observational consequences of our theories.
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Contributor : Emeline Cluzel Connect in order to contact the contributor
Submitted on : Sunday, December 18, 2011 - 5:28:12 PM
Last modification on : Monday, December 13, 2021 - 9:16:02 AM
Long-term archiving on: : Friday, November 16, 2012 - 3:55:10 PM


  • HAL Id : pastel-00653149, version 1


Emeline Cluzel. Inflation in string cosmology. High Energy Physics - Theory [hep-th]. Ecole Polytechnique X, 2011. English. ⟨pastel-00653149⟩



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