Schuecker, P. and Caldwell, R. R. and Böhringer, H. and Collins, C. A. and Guzzo, L. and Weinberg, N. N. (2003) Observational constraints on general relativistic energy conditions, cosmic matter density and dark energy from X-ray clusters of galaxies and type-Ia supernovae. Astronomy & Astrophysics, 402 (1). pp. 53-63. ISSN 0004-6361. doi:10.1051/0004-6361:20030197. https://resolver.caltech.edu/CaltechAUTHORS:20180309-094436197
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Abstract
New observational constraints on the cosmic matter density Ω_m and an effectively redshift-independent equation of state parameter w_x of the dark energy are obtained while simultaneously testing the strong and null energy conditions of general relativity on macroscopic scales. The combination of REFLEX X-ray cluster and type-Ia supernova data shows that for a flat Universe the strong energy condition might presently be violated whereas the null energy condition seems to be fulfilled. This provides another observational argument for the present accelerated cosmic expansion and the absence of exotic physical phenomena related to a broken null energy condition. The marginalization of the likelihood distributions is performed in a manner to include a large fraction of the recently discussed possible systematic errors involved in the application of X-ray clusters as cosmological probes. This yields for a flat Universe, Ω_m = 0.29^(+0.08)_(-0.12) and w_x = -0.95^(+0.30)_(-0.35)(σ errors without cosmic variance). The scatter in the different analyses indicates a quite robust result around w_x, = -1 leaving little room for the introduction of new energy components described by quintessence-like models or phantom energy. The most natural interpretation of the data is a positive cosmological constant with w_x = -1 or something like it.
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| Additional Information: | © 2003 ESO. Received: 22 November 2002. Accepted: 6 February 2003. We thank Stefan Gottlöber and Stefano Ettori for useful discussions. PS acknowledges financial support under grant No. 50 OR 0108. RRC thanks the Santa Barbara KITP for hospitality. This work was supported at the KITP by NSF PHY99-07949, and at Dartmouth by NSF PHY-0099543. | |||||||||
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| Subject Keywords: | cosmology: cosmological parameters - X rays: galaxies: clusters | |||||||||
| Issue or Number: | 1 | |||||||||
| DOI: | 10.1051/0004-6361:20030197 | |||||||||
| Record Number: | CaltechAUTHORS:20180309-094436197 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20180309-094436197 | |||||||||
| Official Citation: | Observational constraints on general relativistic energy conditions, cosmic matter density and dark energy from X-ray clusters of galaxies and type-Ia supernovae P. Schuecker, R. R. Caldwell, H. Böhringer, C. A. Collins, L. Guzzo and N. N. Weinberg A&A, 402 1 (2003) 53-63 DOI: https://doi.org/10.1051/0004-6361:20030197 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 85225 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 09 Mar 2018 18:06 | |||||||||
| Last Modified: | 15 Nov 2021 20:26 |
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