High Redshift X-ray Clusters and ${Ω_{0}}$

X-ray clusters are powerful tools for the determination of cosmological parameters. More specifically, the combined knowledge of the redshift distribution of X-ray clusters together with the luminosity-temperature correlation, $L_X-T_X$ provides us a new test for constraining the mean density of the universe ${Ω_{0}}$. After a brief description of this test, I will present the result of our first attempt to apply this test to current X-ray data.

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