Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Variations of the Cosmic Expansion Field and the Value of the Hubble
  Constant   Four Hubble diagrams are combined to test for the linearity of the cosmic
expansion field. The expansion rate, H_0, is found to decrease by ~5% out to
18000km/s. Beyond this distance the mean value of H_0 is close to the value at
10000km/s. The absolute value of H_0 is derived in two different ways. The one
leads through Cepheids from HST and blue SNe Ia to H_0=57+/-7 (external error)
at 30000km/s. The other uses various distance indicators to the Virgo cluster
whose distance can be extended to 10000km/s by means of only relative cluster
distances; the result of H_0 is closely the same. Independent distances from
purely physical methods (SZ effect, gravitational lenses, and MBW fluctuations)
cluster about H_0(cosmic)=58.

30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat