Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Local dark energy: HST evidence from the expansion flow around Cen A/M83
  galaxy group   A structure with a massive group in its center and a cool expansion outflow
outside is studied around the Cen A galaxy with the use of the Hubble Space
Telescope observations. It is demonstrated that the dynamics of the flow is
dominated by the antigravity of the dark energy background. The density of dark
energy in the cell is estimated to be near the global cosmological density.
This agrees with our previous result from the neighborhood of the Local group.
A notion of the ``Hubble cell'' is introduced as a building block of the local
structure of the universe.

33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga