Galileon-like vector fields
arXiv:1812.11134 · doi:10.1103/PhysRevD.100.025006
Abstract
We construct simple Lagrangians of vector fields which involve second derivatives, but nevertheless lead to second order field equations. These vector fields are, therefore, analogs of generalized Galileons. Our construction is given first in Minkowski space, and then generalizied to include dynamical gravity. We present examples of backgrounds that are stable and ghost-free despite the absence of gauge invariance. Some of these backgrounds violate the Null Energy Condition.
References in corpus (7)
- Covariant Galileon
- Causality, Analyticity and an IR Obstruction to UV Completion
- Dark Energy after GW170817: dead ends and the road ahead
- Strong constraints on cosmological gravity from GW170817 and GRB 170817A
- Implications of the Neutron Star Merger GW170817 for Cosmological Scalar-Tensor Theories
- Galilean Genesis: an alternative to inflation
- UV stable, Lorentz-violating dark energy with transient phantom era