FRW cosmology in Milgrom's bimetric theory of gravity

Journal Article · Sat May 15 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.103525· OSTI ID:21409713

Clifton, Timothy ^[1]; Zlosnik, Thomas G ^[2]

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1. Department of Astrophysics, University of Oxford (United Kingdom)
2. Perimeter Institute of Theoretical Physics, Waterloo (Canada)

We consider spatially homogeneous and isotropic Friedmann-Robertson-Walker solutions of Milgrom's recently proposed class of bimetric theories of gravity. These theories have two different regimes, corresponding to high and low acceleration. We find simple power-law matter dominated solutions in both, as well as solutions with spatial curvature, and exponentially expanding solutions. In the high acceleration limit these solutions behave like the Friedmann-Robertson-Walker solutions of general relativity, with a cosmological constant term that is of the correct order of magnitude to explain the observed accelerating expansion of the Universe. We find that solutions that remain in the high acceleration regime for their entire history, however, require nonbaryonic dark matter fields, or extra interaction terms in their gravitational Lagrangian, in order to be observationally viable. The low acceleration regime also provides some scope to account for this deficit, with solutions that differ considerably from their general relativistic counterparts.

• OSTI ID: 21409713
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 10 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
ACCELERATION
COSMOLOGICAL CONSTANT
COSMOLOGY
ENERGY RANGE
EXPANSION
FIELD THEORIES
FUNCTIONS
GENERAL RELATIVITY THEORY
GRAVITATION
INTERACTIONS
LAGRANGIAN FUNCTION
MATHEMATICAL SOLUTIONS
MATTER
NONLUMINOUS MATTER
RELATIVISTIC RANGE
RELATIVITY THEORY
SIMULATION
UNIVERSE