Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Very-High-Energy Gamma Ray Spectra from Typical Supernovae
  Remnants   Recently measured VHE gamma ray spectra from supernovae remnants (SNRs) are
best fit by power laws with an exponential cutoff. But this feature does not
occur at the `knee-equivalent' energy at which VHE gamma ray spectra are
expected to reflect the `knee' in the otherwise featureless cosmic ray
spectrum. In this article, the VHE gamma ray feature is explained as a
consequence of a recently deduced quantum effect. The effect distinguishes
`trajectory energy' from `particle state energy' and requires that the particle
state energy depends strongly on gravitational potential at very high energies.
Based on this effect and the observed CR spectrum, a tight two-parameter fit is
obtained to the combined VHE gamma ray spectra of SNRs RX J1713.7-3946 and RX
J0852.0-4622 and the Galactic Center ridge.

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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn