Abstract
A set of infinitesimal $Virasoro_\,LVirasoro_\,R$
diffeomorphisms are presented which act non-trivially on the horizon of a
generic Kerr black hole with spin J. The covariant phase space formalism
provides a formula for the Virasoro charges as surface integrals on the
horizon. Integrability and associativity of the charge algebra are shown to
require the inclusion of `Wald-Zoupas' counterterms. A counterterm satisfying
the known consistency requirement is constructed and yields central charges
$c_L=c_R=12J$. Assuming the existence of a quantum Hilbert space on which these
charges generate the symmetries, as well as the applicability of the Cardy
formula, the central charges reproduce the macroscopic area-entropy law for
generic Kerr black holes.
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