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Title: Brane bremsstrahlung in DBI inflation

Abstract

We consider the effect of trapped branes on the evolution of a test brane whose motion generates DBI inflation along a warped throat. The coupling between the inflationary brane and a trapped brane leads to the radiation of non-thermal particles on the trapped brane. We calculate the Gaussian spectrum of the radiated particles and their backreaction on the DBI motion of the inflationary brane. Radiation occurs either due to a parametric resonance when the interaction time is small compared to the Hubble time or a tachyonic resonance when the interaction time is large. In both cases the motion of the inflationary brane after the interaction is governed by a chameleonic potential, which tends to slow it down. We find that a single trapped brane can hardly slow down a DBI inflaton whose fluctuations lead to the Cosmic Microwave Background spectrum. A more drastic effect is obtained when the DBI brane encounters a tightly spaced stack of trapped branes.

Authors:
;  [1]
  1. Institut de Physique Théorique, CEA, IPhT, CNRS, URA 2306, F-91191, Gif/Yvette Cedex (France)
Publication Date:
OSTI Identifier:
22273015
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2010; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BORN-INFELD THEORY; BRANES; BREMSSTRAHLUNG; COMPARATIVE EVALUATIONS; COSMOLOGY; COUPLING; FLUCTUATIONS; INFLATIONARY UNIVERSE; RELICT RADIATION; RESONANCE; TACHYONS; TRAPPING

Citation Formats

Brax, Philippe, and Cluzel, Emeline. Brane bremsstrahlung in DBI inflation. United States: N. p., 2010. Web. doi:10.1088/1475-7516/2010/03/016.
Brax, Philippe, & Cluzel, Emeline. Brane bremsstrahlung in DBI inflation. United States. https://doi.org/10.1088/1475-7516/2010/03/016
Brax, Philippe, and Cluzel, Emeline. 2010. "Brane bremsstrahlung in DBI inflation". United States. https://doi.org/10.1088/1475-7516/2010/03/016.
@article{osti_22273015,
title = {Brane bremsstrahlung in DBI inflation},
author = {Brax, Philippe and Cluzel, Emeline},
abstractNote = {We consider the effect of trapped branes on the evolution of a test brane whose motion generates DBI inflation along a warped throat. The coupling between the inflationary brane and a trapped brane leads to the radiation of non-thermal particles on the trapped brane. We calculate the Gaussian spectrum of the radiated particles and their backreaction on the DBI motion of the inflationary brane. Radiation occurs either due to a parametric resonance when the interaction time is small compared to the Hubble time or a tachyonic resonance when the interaction time is large. In both cases the motion of the inflationary brane after the interaction is governed by a chameleonic potential, which tends to slow it down. We find that a single trapped brane can hardly slow down a DBI inflaton whose fluctuations lead to the Cosmic Microwave Background spectrum. A more drastic effect is obtained when the DBI brane encounters a tightly spaced stack of trapped branes.},
doi = {10.1088/1475-7516/2010/03/016},
url = {https://www.osti.gov/biblio/22273015}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 03,
volume = 2010,
place = {United States},
year = {Mon Mar 01 00:00:00 EST 2010},
month = {Mon Mar 01 00:00:00 EST 2010}
}