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The Physics of Cosmic Acceleration

Caldwell, Robert R. and Kamionkowski, Marc (2009) The Physics of Cosmic Acceleration. Annual Review of Nuclear and Particle Science, 59 . pp. 397-429. ISSN 0163-8998. http://resolver.caltech.edu/CaltechAUTHORS:20100111-100032725

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Abstract

The discovery that the cosmic expansion is accelerating has been followed by an intense theoretical and experimental response in physics and astronomy. The discovery implies that our most basic notions about how gravity works are violated on cosmological distance scales. A simple fix is to introduce a cosmological constant into the field equations for general relativity. However, the extremely small value of the cosmological constant, relative to theoretical expectations, has led theorists to explore numerous alternative explanations that involve the introduction of an exotic negative-pressure fluid or a modification of general relativity. Here we review the evidence for cosmic acceleration. We then survey some of the theoretical attempts to account for it, including the cosmological constant, quintessence and its variants, mass-varying neutrinos, and modifications of general relativity. We discuss experimental and observational tests that may allow us to distinguish among some of the theoretical ideas that have been proposed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1146/annurev-nucl-010709-151330 DOIUNSPECIFIED
http://arjournals.annualreviews.org/doi/abs/10.1146/annurev-nucl-010709-151330PublisherUNSPECIFIED
Additional Information:© 2009 by Annual Reviews. First published online as a Review in Advance on June 23, 2009. We thank S. Carroll, A. Erickcek, J. Frieman, T. Smith, and A. Weinstein for useful comments on an earlier draft. This work was supported at Caltech by Department of Energy grant DE-FG03-92-ER40701 and the Gordon and Betty Moore Foundation and at Dartmouth by National Science Foundation grant AST-0349213.
Group:TAPIR
Funders:
Funding AgencyGrant Number
Caltech by Department of Energy DE-FG03-92-ER40701
Gordon and Betty Moore Foundation UNSPECIFIED
NSFAST-0349213
Subject Keywords:cosmology; dark energy; particle theory; gravitational theory
Record Number:CaltechAUTHORS:20100111-100032725
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100111-100032725
Official Citation:The Physics of Cosmic Acceleration Robert R. Caldwell, Marc Kamionkowski Annual Review of Nuclear and Particle Science 2009 59, 397-429
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17132
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Jan 2010 22:14
Last Modified:26 Dec 2012 11:41

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