Eikonal black hole quasinormal modes are derived as thermal excitations of a probe string worldsheet, with the photon ring Lyapunov exponent acting as an effective temperature and the half-integer offset fixed by a half-density boost representation.
Vishveshwara,Scattering of Gravitational Radiation by a Schwarzschild Black-hole, Nature227(1970) 936
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Thermal Origin of Black Hole Quasinormal Modes
Eikonal black hole quasinormal modes are derived as thermal excitations of a probe string worldsheet, with the photon ring Lyapunov exponent acting as an effective temperature and the half-integer offset fixed by a half-density boost representation.