Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bremsstrahlung photons from the bare surface of a strange quark star   The photon emissivity from the bremsstrahlung process ee-> ee\gamma occuring
in the electrosphere at the bare surface of a strange quark star is calculated.
For surface temperatures T<10^9K, the photon flux exceeds that of e+e- pairs
that are produced via the Schwinger mechanism in the presence of a strong
electric field that binds electrons to the surface of the quark star. The
average energy of photons emitted from the bremsstrahlung process can be 0.5
MeV or more, which is larger than that in e+e- pair annihilation. The
observation of this distinctive photon spectrum would constitute an
unmistakable signature of a strange quark star and shed light on color
superconductivity at stellar densities.

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The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs