The good, the bad and the ugly .... of Horava gravity

Abstract

I review the good, the bad and the ugly of the non-projectable versions of Horava gravity. I explain how this non-relativistic theory was constructed and why it was touted with such excitement as a quantum theory of gravity. I then review some of the issues facing the theory, explaining how strong coupling occurs and why this is such a problem for both phenomenology and the question of renormalisability. Finally I comment on possible violations of Equivalence Principle, and explain why these could be an issue for Blas et al's "healthy extension". This paper was presented as a talk at PASCOS 2010 in Valencia.

arXiv comment7 pages

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Cited by in corpus (44)

• Modified Gravity and Cosmology
• Hořava Gravity at a Lifshitz Point: A Progress Report
• On Lorentz violation in Horava-Lifshitz type theories
• General covariant Horava-Lifshitz gravity without projectability condition and its applications to cosmology
• U(1) symmetry and elimination of spin-0 gravitons in Horava-Lifshitz gravity without the projectability condition
• Status of Horava gravity: A personal perspective
• General relativity limit of Horava-Lifshitz gravity with a scalar field in gradient expansion
• Stability, ghost, and strong coupling in nonrelativistic general covariant theory of gravity with $\lambda \ne 1$
• On strong coupling in nonrelativistic general covariant theory of gravity
• Black holes and global structures of spherical spacetimes in Horava-Lifshitz theory
• Hamiltonian Analysis of Non-Relativistic Covariant RFDiff Horava-Lifshitz Gravity
• Evolution of massive fields around a black hole in Horava gravity
• Horava gravity with mixed derivative terms
• Inflation in general covariant Hořava-Lifshitz gravity without projectability
• Detailed balance condition and ultraviolet stability of scalar field in Horava-Lifshitz gravity
• Inflation in general covariant theory of gravity
• Solar system tests and interpretation of gauge field and Newtonian prepotential in general covariant Hořava-Lifshitz gravity
• Closure of the algebra of constraints for a nonprojectable Hořava model
• Matter in Horava-Lifshitz gravity
• Static electromagnetic fields and charged black holes in general covariant theory of Horava-Lifshitz gravity
• Non-Gaussianity of a single scalar field in general covariant Hořava-Lifshitz gravity
• Lagrange Multiplier Modified Horava-Lifshitz Gravity
• A unified thermodynamic picture of Hořava-Lifshitz black hole in arbitrary space time
• IR Horava-Lifshitz gravity coupled to Lorentz violating matter: A spectral action approach
• Fourth order spatial derivative gravity
• Evolution of electromagnetic and Dirac perturbations around a black hole in Horava gravity
• Gauge-Higgs Unification in Lifshitz Type Gauge Theory
• Heat kernel for flat generalized Laplacians with anisotropic scaling
• Black Holes in Hořava Gravity with Higher Derivative Magnetic Terms
• Note About Equivalence of F(R) and Scalar Tensor Horava-Lifshitz Gravities
• Massive Gravity with Anisotropic Scaling
• Considerations on the Graviton Excitation Modes of Horava-Lifshitz Gravity
• Note About Weyl Invariant Horava-Lifshitz Gravity
• Anisotropic Extra Dimensions
• Vaidya Solutions in General Covariant Hořava-Lifshitz Gravity without Projectability: Infrared Limit
• Weighted Power Counting and Perturbative Unitarity
• Spectral geometry approach to Horava-Lifshitz type theories: gravity and matter sectors in IR regime
• Higher derivative gravity with spontaneous symmetry breaking: Hamiltonian analysis of new covariant renormalizable gravity
• Shear-free Dust Solution in General Covariant Hořava-Lifshitz Gravity
• Cosmological QCD phase transition in steady non-equilibrium dissipative Hořava-Lifshitz early universe
• Aspects of Black Holes in Gravitational Theories with Broken Lorentz and Diffeomorphism Symmetries
• Brane structure from a scalar field in general covariant Horava-Lifshitz gravity
• Conformal Traceless Decomposition of Lagrange Multiplier Modified Horava-Lifshitz Gravity
• Translation gauge field theory of gravity in Minkowski spacetime