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Trapped Brane Features in DBI Inflation

We consider DBI inflation with a quadratic potential and the effect of trapped branes on the inflationary fluctuations. When going through a trapped brane the effective potential of the inflaton receives a contribution whose effect is to induce a jump in the power spectrum of the inflaton perturbations. This feature appears in the power spectrum at a scale corresponding to the size of the sound horizon when the two branes cross each other.

preprint2011arXivOpen access
Philippe BraxEmeline Cluzel
astro-ph.COhep-phhep-th
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Philippe BraxEmeline Cluzel

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