#Kerr spacetime

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A bright two-path interferometer scale model with a charged microsphere held in separated arms while a pale annular horizon marker waits at right

How Fast Can a Horizon Learn Which Path You Took?

A decoherence rate is not yet a learning rate. This research program turns horizon-state overlap into distinguishability, decision information, and an explicit time at which a which-path record becomes too late to erase.

By Brecht Corbeel · September 21, 2026 · 21 min read

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