Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On smoothness of timelike maximal cylinders in three dimensional vacuum
  spacetimes   We show that timelike maximal cylinders in $\RR^{1 + 2}$ always develop
singularities in finite time and that, infinitesimally at a generic
singularity, their time slices are evolved by a rigid motion or a self-similar
motion. We also prove a mild generalization in non-flat backgrounds.

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The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci