Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Linearization of a warped $f(R)$ theory in the higher-order frame   The linearization of a type of $f(R)$ gravity is studied directly in the
higher-order frame for an arbitrary five-dimensional warped space-time
background. The quadratic actions of the normal modes of the scalar, vector,
and tensor perturbations are derived by taking the curvature gauge, under which
the linear perturbation of the scalar curvature is zero, and all the
perturbation equations reduce to second order. By comparing our results to
those obtained in the Einstein frame, we find that the quadratic actions of the
normal modes are equivalent for these two frames.

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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
3
The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio