2007

Entropy Fluctuations in Brane Inflation Models

Brandenberger, Robert H., Frey, Andrew R., Lorenz, Larissa C.

Understand

We study the development of entropy fluctuations in brane inflation in a warped throat, including the brane-antibrane tachyon as the waterfall field.

We find that there is a period at the end of inflation during which the entropy mode associated with the tachyon field increases exponentially.
In turn, the induced entropy seeds a contribution to the curvature fluctuation on cosmological scales which grows rapidly and could exceed the primordial curvature perturbation.
We identify parameter values for which in the absence of back-reaction the induced curvature fluctuations are larger than the primordial adiabatic ones.

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