Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatially covariant gravity: Perturbative analysis and field
  transformations   We make a perturbative analysis of the number of degrees of freedom in a
large class of metric theories respecting spatial symmetries, of which the
Lagrangian includes kinetic terms of both the spatial metric and the lapse
function. We show that, as long as the kinetic terms are degenerate, the theory
propagates a single scalar mode at the linear order in perturbations around a
Friedmann-Robertson-Walker background. Nevertheless, an unwanted mode will
reappear pathologically, either at nonlinear orders around the
Friedmann-Robertson-Walker background, or at linear order around an
inhomogeneous background. In both cases, it turns out that a consistency
condition has to be imposed in order to remove the unwanted mode. This
perturbative approach provides an alternative and also complementary point of
view of the conditions derived in a Hamiltonian analysis. We also discuss the
relation under field redefinitions, between theories with and without the time
derivative of the lapse function.

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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: econ