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APS » Journals » Phys. Rev. Lett. » Volume 92 » Issue 24
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Phys. Rev. Lett. 92, 241302 (2004) [4 pages]

New Dark Energy Constraints from Supernovae, Microwave Background, and Galaxy Clustering

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Yun Wang1 and Max Tegmark2,3
1Department of Physics and Astronomy, University of Oklahoma, 440 West Brooks Street, Norman, Oklahoma 73019, USA
2Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
3Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Received 11 March 2004; published 16 June 2004

Using supernova, cosmic microwave background, and galaxy clustering data, we make the most accurate measurements to date of the dark energy density ρX as a function of cosmic time, constraining it in a rather model-independent way, assuming a flat universe. We find that Einstein’s simplest scenario, where ρX(z) is constant, remains consistent with these new tight constraints and that a big crunch or big rip is more than 50 Gyr away for a broader class of models allowing such cataclysmic events. We discuss popular pitfalls and hidden priors.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.241302
DOI:
10.1103/PhysRevLett.92.241302
PACS:
98.80.Es
 
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