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Title: Count the microstates of a four-dimensional Schwarzschild black hole
Plain: For a black hole with no charge and no spin, like those formed from dead stars, nobody has derived its number of internal states from a microscopic theory. All exact counts so far need extra charges and supersymmetry (a symmetry between matter and force particles).
Precise: Within a UV-complete theory, identify the sector of the Hilbert space that describes a 4D Schwarzschild black hole of mass $M$ and compute the logarithm of its dimension, reproducing $S = 4 \pi G M^2/(\hbar c)$ (entropy in units of $k_B$). An answer is a controlled microscopic count valid away from supersymmetry and extremality.
Settled by: A microscopic state count, in a defined UV-complete theory, that matches $4 \pi G M^{2}/(\hbar c)$ and its logarithmic correction.
Kind: well-posed
Answer type: value
References: (empty)
Literature status: open
Status note: Exact counts exist only for supersymmetric or near-supersymmetric black holes; none for Schwarzschild as of 2026.
Posed since: (empty)