Revisiting the cuscuton as a Lorentz-violating gravity theory
arXiv:1612.01824 · doi:10.1103/PhysRevD.97.064020
Abstract
The cuscuton is a scalar field with infinite speed of propagation. It was introduced in the context of cosmology but it has also been claimed to resemble Horava gravity in a certain limit. Here we revisit the cuscuton theory as a Lorentz-violating gravity theory. We clarify its relation with Horava gravity and Einstein-aether theory, analyze its causal structure, and consider its initial value formulation. Finally, we discuss to which extent the cuscuton theory can be used as a proxy for Horava gravity in the context of gravitational collapse and formation of universal horizons.
9 pages, revised version as published in PRD
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- Cuscuton gravity as a classically stable limiting curvature theory
- Extended Cuscuton as Dark Energy
- VCDM and Cuscuton
- Symmetric Scalars
- The relation between general relativity and a class of Hořava gravity theories
- Dressed Power-law Inflation with Cuscuton
- Accelerating Universe with a stable extra dimension in cuscuton gravity
- Cuscuton Inflation
- Peculiar thermal states in the first-order thermodynamics of gravity
- A new scalar-tensor realization of Hořava-Lifshitz gravity
- On the degrees of freedom count on singular phase space submanifolds
- Theories with limited extrinsic curvature and a nonsingular anisotropic universe
- Generalized McVittie geometry in Horndeski gravity with matter
- Multi-field Cuscuton Cosmology
- Cuscuton Bounce Beyond the Linear Regime: Bispectrum and Strong Coupling Constraints
- Global phase space analysis for a class of single scalar field bouncing solutions in general relativity
- Degrees of Freedom in modified Teleparallel Gravity
- How Much NEC Breaking Can the Universe Endure?
- Revisiting linear stability of black hole odd-parity perturbations in Einstein-Aether gravity
- Cuscuton-like contribution to dark energy evolution
- On the viability of minimal Hořava gravity
- Covariant single-field formulation of effective cosmological bounces
- Spatially covariant gravity with two degrees of freedom in the presence of an auxiliary scalar field: Hamiltonian analysis