Quantization of black hole entropy for black holes in subtracted geometry

We carefully examine the exact analytic spectrum of quasinormal modes of general black holes in the so-called subtracted geometry of maximally supersymmetric supergravity. These black holes have the same area and surface gravity at both the outer and inner horizons as asymptotically flat Kerr black holes. We proceed to explore the relationship with conformal field theories that describe horizon physics of these black holes. As a consequence, we show that it is consistent to view the horizon area of these black holes as being quantized in units of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mn>8</a:mn> <a:mi>π</a:mi> <a:msubsup> <a:mi>l</a:mi> <a:mi>Pl</a:mi> <a:mn>2</a:mn> </a:msubsup> </a:math> .