Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Similarity of structuring in the range 10^{-5} cm to 10^23 cm hints at a
  baryonic cold dark skeleton of the Universe   The presence of skeletal structures of the same distinctive topology
(cartwheels, tubules, etc.), in the range 10^{-5} - 10^23 cm, and a trend
toward self-similarity of these structures are found. These evidences come from
the electron micrography of dust deposits in tokamak (10^{-6} - 10^{-3}cm), the
images of plasma taken in laboratory electric discharges -- tokamaks,
Z-pinches, plasma focus and vacuum spark (10^{-2} - 10 cm), hail particles
(1-10 cm), the images of tornado (10^3 - 10^5 cm), the Hubble Space Telescope
and Chandra X-Ray Observatory public archives' images (up to 10^23 cm). The
redshift surveys of galaxies and quasars suggests the possibility to draw the
above similarity farther, up to 10^26 cm. The above similarity hints at the
presence of a baryonic cold dark skeleton (BCDS) of the Universe, which -- in
the entire range 10^{-5} - 10^26 cm -- may contain ordinary matter in a fractal
condensed form like that in the above-mentioned dust skeletons and hail
particles. The probable compatibility of the BCDS with the major cosmological
facts (Hubble's expansion and cosmic microwave background) is suggested. Our
former hypotheses (and the respective proof-of-concept studies) for the
probable microscopic mechanisms of skeleton's assembling, chemical composition,
and survivability in ambient hot plasmas are discussed briefly. The respective
major cosmological implication is that the purely gravitational description of
the large-scale structure of the Universe is likely to be appended with a
contribution of quantum electromagnetism, presumably in the form of a skeleton
self-assembled from tubular nanostructures (carbon nanotubes or similar
nanostructures of other chemical elements).

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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
2
The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
28
The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph