Dutch physicist and string theorist Erik Verlinde has generated a self-contained, logical derivation of the equivalence principle based on the starting assumption of a holographic universe.
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In July 2012, Polchinski, together with two of his students — Ahmed Almheiri and James Sully — and fellow string theorist Donald Marolf at the University of California, Santa Barbara (UCSB), published a paper whose calculations about black hole radiation seemed to suggest that either Relativity Theory's equivalence principle is wrong, or else a key tenet of quantum mechanics is incorrect.