Covariant power-counting renormalizable gravity: Lorentz symmetry breaking and accelerating early-time FRW universe

Details Covariant power-counting renormalizable gravity: Lorentz symmetry breaking and accelerating early-time FRW universe Covariant power-counting renormalizable gravity: Lorentz symmetry breaking and accelerating early-time FRW universe

2010-07-28

arxiv.org/abs/1007.4856v1

Phys.Rev.D83:023001,2011

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX, 13 pages

Scientific paper

10.1103/PhysRevD.83.023001

We continue the study of covariant power-counting renormalizable gravity constrained by scalar Lagrange multiplier. Lorentz symmetry breaking is investigated in such a theory in comparison with the one in ghost condensation model. Covariant power-counting renormalizable vector gravity which is invariant under $U(1)$ gauge symmetry is proposed. Several forms of vector Lagrange multiplier in this theory are discussed. It is shown that covariant scalar/vector gravity under consideration may have power-law or de Sitter accelerating cosmological solution corresponding to inflationary era. Simplest black hole solution is obtained and dispersion relations for graviton are presented.

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