Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravity beyond linear perturbations in the braneworld   In the present paper, we briefly review recent studies of second-order
gravitational perturbations in braneworld models. After we consider the
possibility of pathological behavior of gravity at higher orders of
perturbation, second-order perturbations are discussed in Randall-Sundrum
braneworld models. Because the mass spectra in these braneworld models are
different, we analyze them using different approaches. In the respective
models, it is discussed that 4D Einstein gravity is approximately recovered at
level of second-order perturbation, although there are some exceptional cases
in the two-brane model.

11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
2
The categories of this paper are: math