Are Galaxy Clusters Suggesting an Accelerating Universe?

Author(s)

Lima, J. A. S. ; Holanda, R. F. L. ; Cunha, J. V. ; Alimi, JM ; Fuzfa, A

• Document type: Journal article
• Source: INVISIBLE UNIVERSE INTERNATIONAL CONFERENCE; v. 1241, p. 6-pg., 2010-01-01.

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 0.14 <= z <= 0.89 [Bonament et al., Astrop. J. 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. (AU)

• FAPESP's process: 04/13668-0 - Cosmology in the era of precision: dark energy, dark matter and background cosmic radiation
• Grantee: Jose Ademir Sales de Lima
• Support Opportunities: Research Projects - Thematic Grants