Details

Autor(en) / Beteiligte

• Petrov, P. K.

Titel

Galileon-like vector fields

Ist Teil von

• Physical review. D, 2019-07, Vol.100 (2), p.025006, Article 025006

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 generalized to include dynamical gravity. We show that the speed of gravitational waves about homogeneous and isotropic backgrounds is equal to the speed of light. 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.