Kaluza-Klein modes in hybrid inflation
arXiv:hep-ph/0209214 · doi:10.1103/PhysRevD.66.107301
Abstract
When one constructs specific models with the fundamental scale as low as the TeV scale, there arise many difficulties. In this paper we examine the hybrid inflation due to bulk scalar fields, which has been proposed to solve the problem of fine-tuning in producing density perturbations. We find that the Kaluza-Klein modes play significant roles, which enhance the speed of the phase transition and alter the reheating process. We also argue that a lower bound must be put to the fundamental scale, in order to construct the successful hybrid inflation due to the bulk scalar fields.
8pages, latex2e, references added, to appear in PRD
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