Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intrinsic alignments of dark matter halos in $f(R)$ gravity simulations   There is a growing interest of utilizing intrinsic alignment (IA) of galaxy
shapes as a geometric and dynamical probe of cosmology. In this paper we
present the first measurements of IA in a modified gravity model using the
gravitational shear-intrinsic ellipticity correlation (GI) and intrinsic
ellipticity-ellipticity correlation (II) functions of dark-matter halos from
$f(R)$ gravity simulations. By comparing them with the same statistics measured
in $\Lambda$CDM simulations, we find that the IA statistics in different
gravity models show distinguishable features, with a trend similar to the case
of conventional galaxy clustering statistics. Thus, the GI and II correlations
are found to be useful in distinguishing between the $\Lambda$CDM and $f(R)$
gravity models. More quantitatively, IA statistics enhance detectability of the
imprint of f(R) gravity on large scale structures by $\sim20\%$ when combined
with the conventional halo clustering in redshift space. Our results
demonstrate the usefulness of IA statistics as a probe of gravity beyond a
consistency test of $\Lambda$CDM and general relativity.

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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: hep-ph