Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energy-momentum complexes in f(R) theories of gravity   Despite the fact that modified theories of gravity, in particular the f(R)
gravity models have attracted much attention in the last years, the problem of
the energy localization in the framework of these models has not been
addressed. In the present work the concept of energy-momentum complexes is
presented in this context. We generalize the Landau-Lifshitz prescription of
calculating the energy-momentum complex to the framework of f(R) gravity. As an
important special case, we explicitly calculate the energy-momentum complex for
the Schwarzschild-de Sitter metric for a general f(R) theory as well as for a
number of specific, popular choices of f(R).

29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn