Marginally stable Schwarzschild-black-hole-non-minimally-coupled-Proca-field bound-state configurations

TL;DR

This paper analytically investigates the stability of non-minimally coupled Proca fields around Schwarzschild black holes, deriving a spectrum that predicts the onset of instabilities based on the Proca field mass and coupling parameters.

Contribution

It provides a compact analytical formula for the critical spectrum of Proca field masses that determine stability thresholds in Schwarzschild black-hole systems with non-minimal coupling.

Findings

Derived a spectrum for Proca field masses near the horizon.

Identified the critical mass $rac{ ext{r}_- - ext{r}_ ext{H}}{ ext{r}_ ext{H}} \u00bb 1$ regime.

Established the stability condition for small-mass Proca fields.

Abstract

It has recently been revealed that, in curved black-hole spacetimes, non-minimally coupled massive Proca fields may be characterized by the existence of poles in their linearized perturbation equations and may therefore develop exponentially growing instabilities. Interestingly, recent numerical computations [H. W. Chiang, S. Garcia-Saenz, and A. Sang, arXiv:2504.04779] have provided compelling evidence that the onset of monopole instabilities in the composed black-hole-field system is controlled by the dimensionless physical parameter $\mu r_-$, where $\mu$ is the proper mass of the non-minimally coupled Proca field and $r_-\equiv (-2\alpha)^{1/3}r_{\text{H}}$ is the radial location of the pole [here $\alpha$ is the non-minimal coupling parameter of the Einstein-Proca theory and $r_{\text{H}}$ is the radius of the black-hole horizon]. In the present paper we use {\it analytical} techniques in order to explore the physical properties of critical (marginally-stable) composed Schwarzschild-black-hole-nonminimally-coupled-monopole-Proca-field configurations. In particular, we derive a remarkably compact analytical formula for the discrete spectrum $\{\mu(r_{\text{H}},r_-;n) \}^{n=\infty}_{n=1}$ of Proca field masses which characterize the critical black-hole-monopole-Proca-field configurations in the dimensionless regime ${{r_- -r_{\text{H}}}\over{r_{\text{H}}}}\ll1$ of near-horizon poles. The physical significance of the analytically derived resonance spectrum stems from the fact that the critical field mass $\mu_{\text{c}}\equiv\mu(r_{\text{H}},r_-;n=1)$ marks the onset of instabilities in the Schwarzschild-black-hole-nonminimally-coupled-monopole-Proca-field system. In particular, composed black-hole-linearized-Proca-field configurations in the small-mass regime $\mu\leq\mu_{\text{c}}$ of the Proca field are stable.