Quantum Fluctuations of Bulk Inflaton in Inflationary Brane World
Shinpei Kobayashi, Kazuya Koyama, Jiro Soda
TL;DR
This paper investigates quantum fluctuations of a bulk inflaton in brane world inflation, finding that deviations from standard inflation are too small to detect, thus supporting the viability of bulk inflaton-driven inflation.
Contribution
It introduces a model of brane world inflation driven by a bulk inflaton and compares its quantum fluctuations to conventional inflation, showing minimal observable differences.
Findings
Deviation in primordial spectrum is too small to observe
Bulk inflaton-driven inflation is viable in brane cosmology
Quantum fluctuations are similar to standard inflation
Abstract
The inflationary scenario for the brane world driven by the bulk inflaton is proposed. The quantum fluctuations of the inflaton is calculated and compared to those of the conventional 4-dimensional inflationary scenario. It is shown that the deviation of the primordial spectrum of this model from that of the conventional one is too small to be observed even if radius is very large. Hence, it turns out that the inflation caused by the bulk inflaton is viable in the context of brane world cosmology.
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