Rotating black holes with primary hair in five-dimensional generalized Proca theory
Phys. Rev. D 114, 064013 – Published 8 September, 2026
DOI: https://doi.org/10.1103/q2b6-khk9
Abstract
This work presents a new class of exact analytic rotating black hole solutions within five-dimensional generalized Proca theories. Through a Kerr-Schild ansatz where the Proca field is set along a null geodesic congruence, the nonlinear field equations reduce to a consistent set of three master equations. This geometric configuration ensures that the vector field remains lightlike on-shell, effectively restricting the theory’s functional couplings to discrete constants and allowing for a fully analytic treatment. The resulting solutions, incorporating a cosmological constant and two independent angular momenta, exhibit primary hair given by an arbitrary function of the non-Killing angular coordinate. We identify several solution branches defined by specific algebraic relations between the Proca coupling constants, providing a significant generalization of the Myers-Perry family. Notably, the metric retains a Kerr-Schild form identical to the Myers-Perry representation, with an additional contribution constructed from the tensor product of the Proca one-form with itself.