Are Galaxy Clusters Suggesting an Accelerating Universe?
Abstract
The present cosmic accelerating stage is discussed through a new kinematic method based on the Sunyaev- Zel'dovich effect (SZE) and X-ray surface brightness data from galaxy clusters. By using the SZE/X-ray data from 38 galaxy clusters in the redshift range [Bonamente et al., Astrop. J. {\bf 647}, 25 (2006)] it is found that the present Universe is accelerating and that the transition from an earlier decelerating to a late time accelerating regime is relatively recent. The ability of the ongoing Planck satellite mission to obtain tighter constraints on the expansion history through SZE/X-ray angular diameters is also discussed. Our results are fully independent on the validity of any metric gravity theory, the possible matter- energy contents filling the Universe, as well as on the SNe Ia Hubble diagram from which the presenting accelerating stage was inferred.
Keywords
Cite
@article{arxiv.1009.2736,
title = {Are Galaxy Clusters Suggesting an Accelerating Universe?},
author = {J. A. S. Lima and R. F. L. Holanda and J. V. Cunha},
journal= {arXiv preprint arXiv:1009.2736},
year = {2011}
}
Comments
6 pages, 6 figures, AIP Conf. Proc. Invisible Universe: Proceedings of the Conference