Abstract
We initiate a systematic study of the state space of non-extremal, stationary
black hole bound states in four-dimensional N = 2 supergravity. Specifically,
we show that an exponential multitude of classically stable "halo" bound states
can be formed between large finite temperature D4-D0 black hole cores and much
smaller, arbitrarily charged black holes at the same temperature. We map out in
full the regions of existence for thermodynamically stable and metastable bound
states in terms of the core's charges and temperature, as well as the region of
stability of the core itself. Several features of these systems, such as a
macroscopic configurational entropy and exponential relaxation timescales, are
similar to those of the extended family of glasses. We draw parallels between
the two with a view toward understanding complex systems in fundamental
physics.
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