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Phys. Rev. D 80, 121302(R) (2009) [5 pages]

No evidence for dark energy dynamics from a global analysis of cosmological data

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Paolo Serra1,*, Asantha Cooray1, Daniel E. Holz2, Alessandro Melchiorri1,3, Stefania Pandolfi1,4, and Devdeep Sarkar1,5
1Center for Cosmology, Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
2Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
3Physics Department and Sezione INFN, University of Rome, “La Sapienza,” Piazzale Aldo Moro 2, 00185 Rome, Italy
4Physics Department and International Centre for Relativistic Astrophysics, University of Rome, “La Sapienza,” Piazzale Aldo Moro 2, 00185 Rome, Italy
5Physics Department, University of Michigan, Ann Arbor, Michigan 48109, USA

Received 29 August 2009; revised 9 November 2009; published 29 December 2009

We use a variant of principal component analysis to investigate the possible temporal evolution of the dark energy equation of state, w(z). We constrain w(z) in multiple redshift bins, utilizing the most recent data from type Ia supernovae, the cosmic microwave background, baryon acoustic oscillations, the integrated Sachs-Wolfe effect, galaxy clustering, and weak lensing data. Unlike other recent analyses, we find no significant evidence for evolving dark energy; the data remain completely consistent with a cosmological constant. We also study the extent to which the time evolution of the equation of state would be constrained by a combination of current- and future-generation surveys, such as Planck and the Joint Dark Energy Mission.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.80.121302
DOI:
10.1103/PhysRevD.80.121302
PACS:
95.36.+x, 98.80.Es

*pserra@uci.edu

 
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