skip to main content

Title: Cosmological matching conditions and galilean genesis in Horndeski's theory

We derive the cosmological matching conditions for the homogeneous and isotropic background and for linear perturbations in Horndeski's most general second-order scalar-tensor theory. In general relativity, the matching is done in such a way that the extrinsic curvature is continuous across the transition hypersurface. This procedure is generalized so as to incorporate the mixing of scalar and gravity kinetic terms in the field equations of Horndeski's theory. Our matching conditions have a wide range of applications including the galilean genesis and the bounce scenarios, in which stable, null energy condition violating solutions play a central role. We demonstrate how our matching conditions are used in the galilean genesis scenario. In doing so, we extend the previous genesis models and provide a unified description of the theory admitting the solution that starts expanding from the Minkowski spacetime.
Authors:
;  [1] ;  [2] ;  [3]
  1. Department of Physics, Rikkyo University, Toshima, Tokyo, 175-8501 (Japan)
  2. Kavli Institute for the Physics and Mathematics of the Universe (IPMU), The University of Tokyo, Kashiwa, Chiba, 277-8568 (Japan)
  3. Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551 (Japan)
Publication Date:
OSTI Identifier:
22370665
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; FIELD EQUATIONS; GENERAL RELATIVITY THEORY; GRAVITATION; MATHEMATICAL SOLUTIONS; ORIGIN; PERTURBATION THEORY; SCALARS; TENSORS