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Sensitive, wide-area X-ray surveys which would be possible with the WFXT will detect huge samples of virialized objects spanning the mass range from sub-groups to the most massive clusters, and extending in redshift to beyond z=2. These samples will be an excellent dataset for carrying out many traditional cosmological tests using the cluster mass function and power spectrum. Uniquely, WFXT will be able not only to detect clusters but also to make detailed X-ray measurements for a large number<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/0903.5320v1">arXiv:0903.5320v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/slmiqfjetbawreaty3jqzw6mcm">fatcat:slmiqfjetbawreaty3jqzw6mcm</a> </span>
more »... f clusters and groups right from the survey data. Very high quality measurements of the cluster mass function and spatial correlation over a very wide range of masses, spatial scales, and redshifts, will be useful for expanding the cosmological discovery space, and in particular, in searching for departures from the "concordant" Lambda-CDM cosmological model. Finding such departures would have far-reaching implications on our understanding of the fundamental physics which governs the Universe.
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