Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Palatini $f(R)$ gravity in the solar system: post-Newtonian equations of
  motion and complete PPN parameters   We perform a post-Newtonian (PN) solar system analysis for Palatini $f(R)$
theories considering finite volume non-spherical planets and with emphasis to
$f(R)$ functions that are analytical about $R=0$. First we consider the
Will-Nordtvedt parametrized post-Newtonian (PPN) formalism, from which the
metric is shown to depend, in general, on terms not covered by the standard PPN
potentials. Hence, a full analysis of the PN equations of motion is performed.
From the latter we conclude that, apart from redefinitions on the internal
energy and the pressure, which cannot be constrained by solar system tests, the
center-of-mass orbits are the same as in general relativity. We discuss further
the physics of these redefinitions and use an argument to extend our analytical
$f(R)$ results towards some non-analytical functions.

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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph