Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $R^n$ gravity is kicking and alive: the cases of Orion and NGC 3198   We analyzed the Rotation Curves of two crucial objects, the Dwarf galaxy
Orion and the low luminosity Spiral NGC 3198, in the framework of $R^n$
gravity. We surprisingly found that the no DM power-law f(R) case fits them
well, performing much better than $\Lambda$CDM Dark Matter halo models. The
level of this unexpected success can be a boost for $R^n$ gravity.

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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: math
29
The categories of this paper are: funct-an
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The categories of this paper are: eess
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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: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat