Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbiting Radiation Stars   We study a numerical solution to Einstein's equation for a compact object
composed of null particles. The solution avoids quantum scale regimes and hence
neither relies upon nor ignores the interaction of quantum mechanics and
gravitation. The solution exhibits a deep gravitational well yet remains
singularity free. In fact, the solution is geometrically flat in the vicinity
of the origin with the flat region being of any desirable scale. The solution
is also observationally distinct from a black hole because a photon from
infinity aimed at an object centered on the origin passes through the origin
and escapes to infinity with a time delay.

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The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex