  Many approaches to a semiclassical description of gravity lead to an integer
black hole entropy. In four dimensions this implies that the Schwarzschild
radius obeys a formula which describes the distance covered by a Brownian
random walk. For the higher-dimensional Schwarzschild-Tangherlini black hole,
its radius relates similarly to a fractional Brownian walk. We propose a
possible microscopic explanation for these random walk structures based on
microscopic chains which fill the interior of the black hole.
