Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parametric Amplification of Metric Fluctuations During Reheating in Two
  Field Models   We study the parametric amplification of super-Hubble-scale scalar metric
fluctuations at the end of inflation in some specific two-field models of
inflation, a class of which is motivated by hybrid inflation. We demonstrate
that there can indeed be a large growth of fluctuations due to parametric
resonance and that this effect is not taken into account by the conventional
theory of isocurvature perturbations. Scalar field interactions play a crucial
role in this analysis. We discuss the conditions under which there can be
nontrivial parametric resonance effects on large scales.

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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th