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Title: Modified Brans-Dicke theory with space-time anisotropic parameters

We consider the ADM formalism of the Brans-Dicke theory and propose a space-time anisotropic extension of the theory by introducing five free parameters. We find that the resulting theory reveals many interesting aspects which are not present in the original BD theory. We first discuss the ghost instability and strong coupling problems which are present in the gravity theory without the full diffeomorphism symmetry and show that they can be avoided in a region of the parameter space. We also perform the post-Newtonian approximation and show that the constraint of the Brans-Dicke parameter ω{sub BD} being large to be consistent with the solar system observations could be evaded in the extended theory. We also discuss that accelerating Universe can be achieved without the need of the potential for the Brans-Dicke scalar.
Authors:
 [1] ;  [2]
  1. Center for Quantum Space-time, Sogang University, Seoul, 121-742 (Korea, Republic of)
  2. Department of Physics and Institute of Basic Science, Sungkyunkwan University Suwon, 440-746 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22370670
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; APPROXIMATIONS; GRAVITATION; INSTABILITY; POTENTIALS; SCALARS; SOLAR SYSTEM; SPACE-TIME; STRONG-COUPLING MODEL; SYMMETRY; UNIVERSE