Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Viscous Modified Gravity on a RS Brane Embedded in AdS5   We consider a modified gravity fluid on a Randall-Sundrum II brane situated
at y=0, the action containing a power \alpha of the scalar curvature. As is
known from 4D spatially flat modified gravity, the presence of a bulk viscosity
may drive the cosmic fluid into the phantom region (w < -1) and thereafter
inevitably into the Big Rip singularity, even it is initially nonviscous and
lies in the quintessence region (w > -1). The condition for this to occur is
that the bulk viscosity contains the power (2\alpha-1) of the scalar expansion.
We combine this with the 5D RS II model, and find that the Big Rip, occurring
for \alpha > 1/2, carries over to the metric for the bulk metric, |y|>0.
Actually, the scale factors on the brane and in the bulk become simply
proportional to each other.

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The categories of this paper are: hep-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs