When1: 1994
Who: James B. Hartle [Hartle, James B.]
What: physicist
Where: USA
Detail: He invented decoherence theory, with Gell-Mann [1994]. With Robert Geroch, he studied quantum gravity as superpositions of all possible four-dimensional space-time curvatures weighted by complex numbers [1986], but it is impossible to prove that two different four-dimensional space-time topologies are the same, so they can be unique or degenerate.
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Date Modified: 2022.0224