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We compare the Infrared Dirac-Born-Infeld (IR DBI) brane inflation model toobservations using a Bayesian analysis. The current data cannot distinguish itfrom the \LambdaCDM model, but is able to give interesting constraints onvarious microscopic parameters including the mass of the brane modulipotential, the fundamental string scale, the charge or warp factor of throats,and the number of the mobile branes. We quantify some distinctive testablepredictions with stringy signatures, such as the large non-Gaussianity, and thelarge, but regional, running of the spectral index. These results illustratehow we may be able to probe aspects of string theory using cosmologicalobservations.

Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations