Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Localization of energy for a Kerr black hole   In the teleparallel equivalent of general relativity the energy density of
asymptoticaly flat gravitational fields can be naturally defined as a scalar
density restricted to a three dimensional spacelike hypersurface. The scalar
density has simple expression in terms of the trace of the torsion tensor. Here
we obtain the formal expression of the localized energy for a Kerr black hole.
The energy inside a surface of constant radius can be explicitly calculated in
the limit of small $a$, the specific angular momentum. Such expression turns
out to be exactly the same as the one obtained by means of the method recently
proposed by Brown and York.

35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math