Robustness of inflation to kinetic inhomogeneities
arxiv(2024)
摘要
We investigate the effects of large inhomogeneities in both the inflaton
field and its momentum. We find that in general, large kinetic perturbations
reduce the number of e-folds of inflation. In particular, we observe that
inflationary models with sub-Planckian characteristic scales are not robust
even to kinetic energy densities that are sub-dominant to the potential energy
density. This strengthens the results of our previous work. In inflationary
models with super-Planckian characteristic scales, despite a reduction in the
number of e-folds, inflation is robust even when the potential energy density
is initially sub-dominant. For the cases we study, the robustness of inflation
strongly depends on whether the inflaton field is driven into the reheating
phase by the inhomogeneous scalar dynamics.
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