Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modified Cold-Dark-Matter models in light of 53W091 an old galaxy at
  high z   The epoch of galaxy formation provides an important additional test of
cosmological theories. Cold-dark-matter (CDM) models with cosmological constant
($\Lambda$) are designed to account for the observed excess power in galaxy
distribution, but at the same time suppress the power on small scales pushing
galaxy formation to recent epochs. We point out that the recently discovered
high redshift galaxy, 53W091, with accurate age measurements (Dunlop et al
1996) provides a particularly important test of these models. In the flat
$\Lambda$-dominated Universe, the redshift of formation of 53W091 decreases
with decreasing $\Omega$. However, in the modified CDM models decreasing
$\Omega$ suppresses the small scale power in the density field and this effect
turns out to be dominant. We estimate the mass of the galaxy and show that it
represents a very rare and unlikely event in the density field of such models.
Similar problems would occur in other modifications of the CDM cosmogonies.

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The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg