Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing statistical significance of large quasar groups with sheets
  model of large scale structure   We argue that the largest group of quasars (LQG) U1.27 discovered by Clowes
et al. (2013) in the SDSS DR7 catalogue does not contradict the hypothesis of
Poisson distribution of quasars. We found that random catalogues with the same
shape and number of QSOs as the real sample may contain groups which resemble
U1.27. By simulating quasar catalogues with embedded model of the large scale
structure we also found that the size of LQGs selected by MST and similar
methods does not correspond to the scale of homogeneity of the Universe and can
be explained by the percolation process.

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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
3
The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom