Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Stationary Universe and the Basics of Relativity Theory   A stationary line element of general relativity seems to be compatible to
essential cosmological facts (though only as far as one can expect solving the
nonlinear Einstein equations neglecting local cosmic evolution and all spatial
inhomogeneities as well).
  There is a preferred spatially Euclidean cosmic reference frame where the
extra-galactic speed of light is constant c* = c, and the galaxies are
statistically at rest. Spectral rods and atomic clocks, however, do not
indicate this cosmic space and this cosmic time.
  The solutions put up here for discussion are suitable to avoid serious
difficulties in physics such as a beginning of the universe as a whole or the
necessity of continuous creation of matter or an empty universe with a
cosmological constant but no matter at all.
  Especially from the stationary line element, it follows a negative cosmic
gravitational pressure of one third the critical energy density. In addition,
there is an average baryonic radiation density equivalent to a black body
radiation of approximately 3 K.
  The resulting increase of the time rate of natural clocks in comparison with
cosmic time is a simple explanation for the redshift of starlight. This
redshift turns out to be independent of time, thus indicating a stationary
universe.

18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex