Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Growth Index of DGP Model and Current Growth Rate Data   Recently, some efforts focus on differentiating dark energy and modified
gravity with the growth function $\delta(z)$. In the literature, it is useful
to parameterize the growth rate $f\equiv d\ln\delta/d\ln a=\Omega_m^\gamma$
with the growth index $\gamma$. In this note, we consider the general DGP model
with any $\Omega_k$. We confront the growth index of DGP model with currently
available growth rate data and find that the DGP model is still consistent with
it. This implies that more and better growth rate data are required to
distinguish between dark energy and modified gravity.

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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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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: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph