Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmological constrains from X-ray AGN clustering and SNIa data   We put constraints on the main cosmological parameters of different spatially
flat cosmological models by combining the recent clustering results of
XMM-Newton soft (0.5-2 keV) X-ray sources, which have a redshift distribution
with median redshift $z\sim 1.2$, and SNIa data. Using a likelihood procedure
we find that the model which best reproduces the observational data and that is
consistent with stellar ages is the concordance $\Lambda$CDM model with:
$\Omega_{\rm m}\simeq 0.28$, $w\simeq -1$, $H_{\circ} \simeq 72$ km s$^{-1}$
Mpc$^{-1}$, $t_{\circ}\simeq 13.5$Gyr and has an X-ray AGN clustering evolution
which is constant in physical coordinates. For a different clustering evolution
model (constant in comoving coordinates) we find another viable model, although
less probable due to the smaller age of the Universe, with $\Omega_{\rm
m}\simeq 0.38$, $w\simeq -1.25$, $H_{\circ} \simeq 70$ km s$^{-1}$ Mpc$^{-1}$,
$t_{\circ}\simeq 12.9$Gyr.

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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: math-ph
1
The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom