Multifield DBI Inflation and Non-Gaussianities

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We analyze the trajectories for multifield DBI inflation, which can arise in brane inflation models, and show that the trajectories are the same as in typical slow roll inflation. We calculate the power spectrum and find that the higher derivative terms of the DBI action lead to a suppression of the contribution from the isocurvature perturbations. We also calculate the bispectrum generated by the isocurvature perturbation, and find that it leads to distinctive features.
7 pages, 4 figures; v2. references added; v3. typos corrected, matches published version

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High Energy Physics - Theory, Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/193691

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0709.3299
 http://arxiv.org/abs/0709.3299
 Phys.Rev.D77:023511,2008
 doi:10.1103/PhysRevD.77.023511

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arXiv