We consider the Lagrangian of a vector field with derivative self-interactions with a priori
arbitrary coefficients. Starting with a flat space-time we show that for a special choice of the …

We demonstrate that black holes and stars in general relativity can be destabilized by
perturbations of nonminimally coupled vector fields. Focusing on static and spherically …

A bstract It has recently been argued that half degrees of freedom could emerge in Lorentz
and parity invariant field theories, using a non-linear Proca field theory dubbed Proca-Nuevo …

Proca-Nuevo is a non-linear theory of a massive spin-1 field which enjoys a non-linearly
realized constraint that distinguishes it among other generalized vector models. We show …

We propose a new class of Proca interactions that enjoy a nontrivial constraint and hence
propagates the correct number of degrees of freedom for a healthy massive spin-1 field. We …

Gravitational wave (GW) oscillations occur whenever there are additional tensor modes
interacting with the perturbations of the metric coupled to matter. These extra modes can …

The generalized SU (2) Proca theory (GSU2P) is a variant of the well known generalized
Proca theory where the vector field belongs to the Lie algebra of the SU (2) group of global …

We present a systematic construction of the most general first order Lagrangian describing
an arbitrary number of interacting Maxwell and Proca fields on Minkowski spacetime. To this …

The U (1) gauge-invariant scalar-vector-tensor theories, which catches 5 degrees of
freedom, are valuable for its implications to inflation problems, generation of primordial …

As a modified gravity theory that introduces new gravitational degrees of freedom, the
generalized SU (2) Proca theory (GSU2P for short) is the non-Abelian version of the well …