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Abstract: We investigate density perturbations generated through modulated reheatingwhile inflation is driven by a conformally coupled scalar field. A largerunning of the spectral index is obtained, which reflects the basic nature ofconformal inflation that higher-order time derivatives of the Hubble parameterduring inflation are not necessarily small. This feature may allow us todistinguish between conformal inflation models and standard minimally coupledones. We also investigate how the resulting fluctuations are modified whenthere is a deviation from an exact conformal coupling between the inflaton andgravity. Finally, we apply our results to the warped brane inflation model andsee that observational bounds from the WMAP5 data suggest a blue tilted densityperturbation spectrum.



Author: Takeshi Kobayashi, Shinji Mukohyama

Source: https://arxiv.org/







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