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Title: Stable models of superacceleration

Abstract

We discuss an instability in a large class of models where dark energy is coupled to matter. In these models the mass of the scalar field is much larger than the expansion rate of the Universe. We find models in which this instability is absent, and show that these models generically predict an apparent equation of state for dark energy smaller than -1, i.e., superacceleration. These models have no acausal behavior or ghosts.

Authors:
;  [1]
  1. Department of Physics and Astronomy University of California, Irvine, California 92697 (United States)
Publication Date:
OSTI Identifier:
20933288
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 75; Journal Issue: 10; Other Information: DOI: 10.1103/PhysRevD.75.103504; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMOLOGICAL MODELS; EQUATIONS OF STATE; EXPANSION; INSTABILITY; MASS; NONLUMINOUS MATTER; SCALAR FIELDS; UNIVERSE

Citation Formats

Kaplinghat, Manoj, and Rajaraman, Arvind. Stable models of superacceleration. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.103504.
Kaplinghat, Manoj, & Rajaraman, Arvind. Stable models of superacceleration. United States. https://doi.org/10.1103/PHYSREVD.75.103504
Kaplinghat, Manoj, and Rajaraman, Arvind. 2007. "Stable models of superacceleration". United States. https://doi.org/10.1103/PHYSREVD.75.103504.
@article{osti_20933288,
title = {Stable models of superacceleration},
author = {Kaplinghat, Manoj and Rajaraman, Arvind},
abstractNote = {We discuss an instability in a large class of models where dark energy is coupled to matter. In these models the mass of the scalar field is much larger than the expansion rate of the Universe. We find models in which this instability is absent, and show that these models generically predict an apparent equation of state for dark energy smaller than -1, i.e., superacceleration. These models have no acausal behavior or ghosts.},
doi = {10.1103/PHYSREVD.75.103504},
url = {https://www.osti.gov/biblio/20933288}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 10,
volume = 75,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}