Spin-Induced Scalarized Black Holes
No TL;DR found
Abstract
It was recently shown that a scalar field suitably coupled to the\nGauss-Bonnet invariant $\\mathcal{G}$ can undergo a spin-induced linear\ntachyonic instability near a Kerr black hole. This instability appears only\nonce the dimensionless spin $j$ is sufficiently large, that is, $j \\gtrsim\n0.5$. A tachyonic instability is the hallmark of spontaneous scalarization.\nFocusing, for illustrative purposes, on a class of theories that do exhibit\nthis instability, we show that stationary, rotating black hole solutions do\nindeed have scalar hair once the spin-induced instability threshold is\nexceeded, while black holes that lie below the threshold are described by the\nKerr solution. Our results provide strong support for spin-induced black hole\nscalarization.\n