Abstract
We compare the simplest realistic brane inflationary model to recent cosmological data,including Wilkinson Microwave Anisotropy Probe (WMAP) three-year cosmic microwavebackground (CMB) results, Sloan Digital Sky Survey Luminous Red Galaxies(SDSS LRG) power spectrum data and Supernovae Legacy Survey (SNLS) type1a supernovae distance measures. Here, the inflaton is simply the position of aD3-brane which is moving towards a -brane sitting at the bottom of a throat (a warped, deformed conifold) in theflux compactified bulk in type IIB string theory. The analysis includes both theusual slow-roll scenario and the Dirac–Born–Infeld scenario of slow but relativisticrolling. Requiring that the throat is inside the bulk greatly restricts the allowedparameter space. We discuss possible scenarios in which a large tensor modeand/or non-Gaussianity may emerge. Here, the properties of a large tensor modedeviate from that in the usual slow-roll scenario, providing a possible stringysignature. Overall, within the brane inflationary scenario, the cosmological data areproviding information about the properties of the compactification of the extradimensions.
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