For three-parameter Kerr solutions, the Matzner-Misner SL(2,R) Casimir charge equals the Bekenstein-Hawking entropy, and the Geroch Kac-Moody level is also the entropy.
Witten, Coadjoint orbits of the Virasoro group , Communications in Mathematical Physics 114 (1988) 1
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$\mathrm{SL}(2,\mathbb{R})$ families of Kerr black holes
For three-parameter Kerr solutions, the Matzner-Misner SL(2,R) Casimir charge equals the Bekenstein-Hawking entropy, and the Geroch Kac-Moody level is also the entropy.