Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Goldberg--Kerr Approach to Lorentz Covariant Gravity   The approach to asymptotic electromagnetic fields introduced by Goldberg and
Kerr is used to study various aspects of Lorentz Covariant Gravity. Retarded
multipole moments of the source, the central objects of this study, are
defined, and a sequence of conservation equations for these are derived. These
equations are used extensively throughout the paper. The solution of the
linearized Einstein equation is obtained in terms of the retarded moments for a
general bound source, correct to $O(r^{-4})$. This is used to obtain the
peeling--off of the linearized field, and to study the geometric optics
approximation for the field and for the energy-momentum pseudotensor of the
field. It is shown that the energy-momentum 4-vector splits into the `total
radiated 4-momentum' and the `bound 4-momentum of the source', similar to the
case of the electromagnetic field. In the case of a source which has only
retarded pole, dipole and quadrupole moments, a decomposition into arbitrary
functions of a null coordinate is obtained which allows comparison with the
solutions for linearized gravity obtained by other authors.

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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
16
The categories of this paper are: stat
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph