Cosmology of a universe with spontaneously broken Lorentz symmetry

Journal Article · Thu Feb 15 00:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.044014· OSTI ID:21011079

Ferreira, P G ^[1]; Gripaios, B M; Zlosnik, T G ^[1]; Saffari, R ^[2]

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1. Astrophysics and Theoretical Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH (United Kingdom)
2. Astrophysics and Theoretical Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH (United Kingdom) and Institute for Advanced Studies in Basic Sciences, Gava Zang, P.O.Box 45195-1159 Zanjan (Iran, Republic of)

A self-consistent effective field theory of modified gravity has recently been proposed with spontaneous breaking of local Lorentz invariance. The symmetry is broken by a vector field with the wrong-sign mass term and it has been shown to have additional graviton modes and modified dispersion relations. In this paper we study the evolution of a homogeneous and isotropic universe in the presence of such a vector field with a minimum lying along the timelike direction. A plethora of different regimes is identified, such as accelerated expansion, loitering, collapse, and tracking.

• OSTI ID: 21011079
• Journal Information: Physical Review. D, Particles Fields, Vol. 75, Issue 4; Other Information: DOI: 10.1103/PhysRevD.75.044014; (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
ACCELERATION
COSMOLOGY
DISPERSION RELATIONS
GRAVITATION
GRAVITONS
LORENTZ INVARIANCE
QUANTUM FIELD THEORY
SYMMETRY
SYMMETRY BREAKING
UNIVERSE
VECTOR FIELDS