Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correlations Between the Cosmic X-ray and Microwave Backgrounds:
  Constraints on a Cosmological Constant   In universes with significant curvature or cosmological constant, cosmic
microwave background (CMB) anisotropies are created very recently via the
Rees-Sciama or integrated Sachs-Wolfe effects. This causes the CMB anisotropies
to become partially correlated with the local matter density (z < 4). We
examine the prospects of using the hard (2-10 keV) X-ray background as a probe
of the local density and the measured correlation between the HEAO1 A2 X-ray
survey and the 4-year COBE-DMR map to obtain a constraint on the cosmological
constant. The 95% confidence level upper limit on the cosmological constant is
\Omega_\Lambda \leq 0.5, assuming that the observed fluctuations in the X-ray
map result entirely from large scale structure. (This would also imply that the
X-rays trace matter with a bias factor of b_x = 5.6 \Omega_m^{0.53}.) This
bound is weakened considerably if a large portion of the X-ray fluctuations
arise from Poisson noise from unresolved sources. For example, if one assumes
that the X-ray bias is b_x = 2., then the 95% confidence level upper limit is
weaker, \Omega_\Lambda \leq 0.7. More stringent limits should be attainable
with data from the next generation of CMB and X-ray background maps.

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The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg