Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: EGRET Excess of Diffuse Galactic Gamma Rays as Tracer of Dark Matter   The public data from the EGRET space telescope on diffuse Galactic gamma rays
in the energy range from 0.1 to 10 GeV are reanalyzed with the purpose of
searching for signals of Dark Matter annihilation (DMA). The analysis confirms
the previously observed excess for energies above 1 GeV in comparison with the
expectations from conventional Galactic models. In addition, the excess was
found to show all the key features of a signal from Dark Matter Annihilation
(DMA): a) the excess is observable in all sky directions and has the same shape
everywhere, thus pointing to a common source; b) the shape corresponds to the
expected spectrum of the annihilation of non-relativistic massive particles
into - among others - neutral $\pi^0$ mesons, which decay into photons. From
the energy spectrum of the excess we deduce a WIMP mass between 50 and 100 GeV,
while from the intensity of the excess in all sky directions the shape of the
halo could be reconstructed. The DM halo is consistent with an almost spherical
isothermal profile with substructure in the Galactic plane in the form of
toroidal rings at 4 and 14 kpc from the center. These rings lead to a peculiar
shape of the rotation curve, in agreement with the data, which proves that the
EGRET excess traces the Dark Matter.

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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: stat
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph