Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The XMM Cluster Survey: Testing chameleon gravity using the profiles of
  clusters   The chameleon gravity model postulates the existence of a scalar field that
couples with matter to mediate a fifth force. If it exists, this fifth force
would influence the hot X-ray emitting gas filling the potential wells of
galaxy clusters. However, it would not influence the clusters' weak lensing
signal. Therefore, by comparing X-ray and weak lensing profiles, one can place
upper limits on the strength of a fifth force. This technique has been
attempted before using a single, nearby cluster (Coma, $z=0.02$). Here we apply
the technique to the stacked profiles of 58 clusters at higher redshifts
($0.1<z<1.2$), including 12 new to the literature, using X-ray data from the
XMM Cluster Survey (XCS) and weak lensing data from the Canada France Hawaii
Telescope Lensing Survey (CFHTLenS). Using a multi-parameter MCMC analysis, we
constrain the two chameleon gravity parameters ($\beta$ and $\phi_{\infty}$).
Our fits are consistent with general relativity, not requiring a fifth force.
In the special case of $f(R)$ gravity (where $\beta = \sqrt{1/6}$), we set an
upper limit on the background field amplitude today of $|f_{\rm{R0}}| < 6
\times 10^{-5}$ (95% CL). This is one of the strongest constraints to date on
$|f_{\rm{R0}}|$ on cosmological scales. We hope to improve this constraint in
future by extending the study to hundreds of clusters using data from the Dark
Energy Survey.

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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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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: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: math