Multi-field DBI inflation

by Mr Sebastien Renaux-Petel (APC (Paris))

Wednesday 14 May 2008, 11:00 → 12:00 Europe/Zurich

1/1-025 (CERN)

Originally, Dirac-Born-Infeld (DBI) inflation is a string-inspired inflation scenario where a probe D3-brane moves in the radial direction of a higher-dimensional warped throat. The speaker will first review this scenario, highlighting the difference with conventional inflation concerning the spectrum of perturbations and non-Gaussianities. He will then show how to take into account the angular motion of the brane in the extra-dimensions, which can have drastic consequences for observational quantities.

References:
hep-th/0310221, 'Scalar Speed Limits and Cosmology: Acceleration from D-cceleration'
(hep-th) 0709.3299, 'Multifield DBI Inflation and Non-Gaussianities'
(hep-th) 0804.3139, 'Primordial fuctuations and non-Gaussianities in multi-field DBI infation'