Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Closed Timelike Curves in Flat Lorentz Spacetimes   We consider the region of closed timelike curves (CTC's) in three-dimensional
flat Lorentz spacetimes. The interest in this global geometrical feature goes
beyond the purely mathematical. Such spacetimes may be considered
lower-dimensional toy models of sourceless Einstein gravity or cosmology. In
particular, our interest in this note will be to find the set free of CTC's for
$E/<\gamma>$, where $E$ is modeled on Minkowski space and $\gamma$ is a
Poincar\'e transformation. We describe the set free of CTC's where $\gamma$ is
hyperbolic, parabolic and elliptic.

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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
1
The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin