Abstract
We obtain observational constraints on Randall–Sundrum type IIbraneworld inflation using a compilation of data including WMAP,the 2dF and latest SDSS galaxy redshift surveys. We placeconstraints on three classes of inflation models (large-field,small-field and hybrid models) in the high-energy regime, whichexhibit different behaviour compared to the low-energy case.The quartic potential is outside the 2σ observationalcontour bound for a number of e-folds less than 60, and steepinflation driven by an exponential potential is excludedbecause of its high tensor-to-scalar ratio. It is more difficultto strongly constrain small-field and hybrid models due toadditional freedoms associated with the potentials, but weobtain upper bounds for the energy scale of inflation and themodel parameters in certain cases. We also discuss possible waysto break the degeneracy of consistency relations andinflationary observables.
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