Stable models of superacceleration

Journal Article · Tue May 15 00:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.103504· OSTI ID:20933288

Kaplinghat, Manoj; Rajaraman, Arvind ^[1]

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1. Department of Physics and Astronomy University of California, Irvine, California 92697 (United States)

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.

• OSTI ID: 20933288
• Journal Information: Physical Review. D, Particles Fields, Vol. 75, Issue 10; Other Information: DOI: 10.1103/PhysRevD.75.103504; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGICAL MODELS
EQUATIONS OF STATE
EXPANSION
INSTABILITY
MASS
NONLUMINOUS MATTER
SCALAR FIELDS
UNIVERSE