Modification to the power spectrum in the brane world inflation driven by the bulk inflaton
Bin Wang, Li-Hui Xue, Xinmin Zhang, W-Y. P. Hwang
TL;DR
This paper analyzes how the presence of an extra dimension modifies the power spectrum of scalar perturbations in brane world inflation driven by a bulk inflaton, highlighting the dependence on initial vacuum choices.
Contribution
It introduces a calculation of the modified power spectrum in brane world inflation with a bulk inflaton, emphasizing the impact of the fifth dimension and vacuum selection.
Findings
Power spectrum is altered by the fifth dimension.
The correction depends on the initial vacuum choice.
Results differ from standard 4D inflation models.
Abstract
We compute the cosmological perturbations generated in the brane world inflation driven by the bulk inflaton. Different from the model that the inflation is a brane effect, we exhibit the modification of the power spectrum of scalar perturbations due to the existence of the fifth dimension. With the change of the initial vacuum, we investigate the dependence of the correction of the power spectrum on the choice of the vacuum.
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