Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Particle Collision near 1+1- Dimensional Horava-Lifshitz Black Hole and
  Naked Singularity   The unbounded center of mass (CM) energy of oppositely moving colliding
particles near horizon emerge also in 1+1- dimensional Horava-Lifshitz gravity.
This theory has imprints of renormalizable quantum gravity characteristics in
accordance with the method of simple power counting. Surpris- ingly the result
obtained is not valid for a 1- dimensional Compton- like process between an
outgoing photon and an infalling massless/ massive particle. It is possible to
achieve unbounded CM energy due to collision between infalling photons and
particles. The source of outgoing particles may be at- tributed to an explosive
process just outside the horizon for a black hole and the naturally repulsive
character for the case of a naked singularity. It is found that absence of
angular momenta in 1+1- dimensions does not yield unbounded energy for
collisions in the vicinity of naked singularities.

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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph