TL;DR
This paper explores how spatial fluctuations in parameters like couplings or masses during inflation can modulate inflaton velocity, leading to curvature perturbations and variations in e-foldings across different regions of the universe.
Contribution
It introduces the concept of modulated inflation, where inflaton velocity fluctuations generate curvature perturbations, providing a new mechanism for primordial density fluctuations.
Findings
Inflaton velocity fluctuations can produce curvature perturbations.
Spatial variations in parameters affect the number of e-foldings.
The mechanism offers an alternative to traditional inflationary perturbation models.
Abstract
We consider cosmological perturbations caused by modulated inflaton velocity. During inflation, the inflaton motion is damped and the velocity is determined by the parameters such as couplings or masses that may depend on light fields(moduli). The number of e-foldings is different in different patches if there are spatial fluctuations of such parameters. Based on this simple idea, we consider ``modulated inflation'' in which the curvature perturbation is generated by the fluctuation of the inflaton velocity. This talk is based on our recent papers.
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