Simon Fraser University
SFU Cosmology Seminars

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Tuesday, 21 July 2009, 14:00 in P8445B

Dr. Daniele Steer (APC, Paris)

Multi-field DBI inflation: primordial perturbations and non-Gaussianities

In this talk I discuss some aspects of multiple-field inflation, and more specifically so-called Dirac-Born-Infeld (DBI) inflation. DBI inflation emerges when one tries to embed inflation in a string-theory setting, and is based on the motion of a brane in a higher dimensional space-time: the directions in which the brane can move correspond to the different inflationary fields. We discuss the (correct!) action for DBI-inflation and then calculate some of its observational cosmological consequences, particularly for non-gaussianities in the CMB.

Seminars in 2008:

2008-09-25 14:00 in IRMACS - Dmitri Korotkin (Concordia University): Canonical quantization of Einstein-Rosen gravitational waves with two polarizations
2008-10-02 14:00 in IRMACS - Andrei Frolov (SFU): A singularity problem with f(R) dark energy
2008-11-14 14:30 in AQ3181 - Robert Brandenberger (McGill University): String theory and the very early universe (physics colloquium)
2009-01-23 14:30 in P8445B - Fotini Markopoulou (Perimeter): Two ways to derive a spacetime in quantum gravity
2009-01-27 14:00 in P8445A - Edward Chapin (UBC): Detecting massive star-forming galaxies at z>1 using BLAST and SCUBA-2 submillimetre wavelength surveys
2009-02-03 14:00 in P8445A - Subinoy Das (UBC): Late forming dark matter
2009-02-20 14:30 in AQ3182 - Mark Trodden (Syracuse University): Gravitational approaches to cosmic acceleration (physics colloquium)
2009-02-24 14:00 in P8445A - Adam Ritz (University of Victoria): Probing pseudoscalar perturbations with CMB polarization
2009-03-03 14:00 in P8445A - John Ward (University of Victoria): Gravitational wave constraints on multi-brane inflation
2009-03-10 14:00 in P8445A - Phil Gregory (UBC): Mining for extra-solar planets with a Bayesian MCMC Kepler periodogram
2009-03-27 14:30 in AQ3182 - Suzanne Staggs (Princeton University): The impact of the last 13 billion years and of the first 10-35 seconds on the CMB (physics colloquium)
2009-05-05 14:00 in P8445B - Justin Khoury (University of Pennsylvania): Cascading gravity
2009-07-21 14:00 in P8445B - Daniele Steer (APC, Paris): Multi-field DBI inflation: primordial perturbations and non-Gaussianities

[ See complete seminar archives | iCal feed ]

Modified by Andrei Frolov <frolov@sfu.ca> on 2023-11-01