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Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations

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arxiv 0710.1812 v3 pith:ESQS6VTY submitted 2007-10-09 hep-th astro-phhep-ph

Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations

classification hep-th astro-phhep-ph
keywords braneobservationsabledirac-born-infeldinflationinfraredlargemodel
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We compare the Infrared Dirac-Born-Infeld (IR DBI) brane inflation model to observations using a Bayesian analysis. The current data cannot distinguish it from the \LambdaCDM model, but is able to give interesting constraints on various microscopic parameters including the mass of the brane moduli potential, the fundamental string scale, the charge or warp factor of throats, and the number of the mobile branes. We quantify some distinctive testable predictions with stringy signatures, such as the large non-Gaussianity, and the large, but regional, running of the spectral index. These results illustrate how we may be able to probe aspects of string theory using cosmological observations.

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