Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-linear curvature perturbation in multi-field inflation models with
  non-minimal coupling   Using the \delta N formalism we consider the non-linear curvature
perturbation in multi-field models of inflation with non-minimal coupling. In
particular, we focus on the relation between the \delta N formalism as applied
in the conformally related Jordan and Einstein frames. Exploiting results
already known in the Einstein frame, we give expressions for the power
spectrum, spectral tilt and non-gaussianity associated with the Jordan frame
curvature perturbation. In the case that an adiabatic limit has not been
reached, we find that in general these quantities differ from those associated
with the Einstein frame curvature perturbation, and also confirm their
equivalence in the absence of isocurvature modes. We then proceed to consider
two analytically soluble examples, the first involving a non-minimally coupled
`spectator' field and the second being a non-minimally coupled extension of the
multi-brid inflation model. In the first model we find that predictions can
easily be brought into agreement with the recent Planck results, as the
tensor-to-scalar ratio is generally small, the spectral tilt tuneable and the
non-gaussianity suppressed. In the second model we find that predictions for
all three parameters can differ substantially from those predicted in the
minimally coupled case, and that the recent Planck results for the spectral
tilt can be used to constrain the non-minimal coupling parameters.

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The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
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The categories of this paper are: stat
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex