Trapped Brane Features in DBI Inflation

2010/10/21 by Philippe Brax, Brax, Philippe, Emeline Cluzel +1 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Geophysics and Gravity Measurements #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)

paper · pdf · doi:10.48550/arxiv.1010.4462

openalex publication_date 2010/10/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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.

Citations

• TASI Lectures on Inflation
• Brane inflation and reheating
• de Sitter vacua in string theory
• Cosmological perturbations

Cited by

• Bound to bounce: a coupled scalar-tachyon model for a smooth bouncing/cyclic universe

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