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Abstract: In the inflationary universe, there can be light fields other than theinflaton. We explore a possibility that such light fields source the primordialperturbations, while minimally affecting the inflaton dynamics. We show thatduring inflation, fluctuations of the light fields can be converted toadiabatic curvature perturbations, which accumulate and become significant bythe end of the inflationary era. An additional goal of this work is todistinguish between light fields which can-cannot be ignored during inflation.Such criteria become useful for examining cosmological scenarios with multiplefields. As concrete examples, our results are applied to D-brane inflationmodels. We consider effects from KK modes oscillation modes of wrapped branesin monodromy-driven large-field models, and angular directions of throatgeometries in warped D-brane inflation.



Autor: Takeshi Kobayashi, Shinji Mukohyama

Fuente: https://arxiv.org/



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