Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical infeasibility of geodesic dissipative dust as a source of
  gravitational radiation   Using a framework based on the 1+3 formalism, we show that a source
represented by a geodesic, dissipative, rotational dust, endowed with axial and
reflection symmetry, violates regularity conditions at the center of the fluid
distribution, unless the dissipative flux vanishes. In this latter case the
vorticity also must vanish, and the resulting spacetime is
Friedman--Robertson--Walker (FRW). Therefore it does not produce gravitational
radiation.

15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio