Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unconstrained degrees of freedom for gravitational waves,
  $\beta$--foliations and spherically symmetric initial data   A new parameterization of unconstrained degrees of freedom for gravitational
field, used in Classical and Quantum Gravity {\bf 11}, 1055-1068 (1994), has
been generalized to one-parameter family of such parameterizations, depending
on a real parameter $\beta \in [0,2]$. The description introduced in CQG 11,
1055 corresponds to the special choice $\beta=0$. The method is closely related
to the proof of the positivity of the energy presented in Phys. Rev. D {\bf
36}, 1041-1044 (1987) where $\beta$-foliations have been introduced (see also
applications to black holes dynamics in Classical and Quantum Gravity {\bf 6},
1535-1539 (1989) and Acta Physica Polonica B {\bf 25}, 1413-17 (1994)).
Spherically symmetric initial data corresponding to trivial degrees of freedom
is analyzed along these lines. In particular, the quasi-local energy content of
the Schwarzschild initial data is analyzed for different choices of the
$\beta$-gauge.

19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph