Schwortinger's equation acts very differently depending on whether the energy of the universe is zero or non zero. A universe with zero energy and therefore no obvious time evolution can actually have sort of hidden time evolution, he says. "Just like reasons why things happen are emergent in our microscopic world, time evolution can also be emergent" 'It's not a hundred % sure, but in certain very, very plausible versions of cosmological six the energy ofthe universe is exactly zero,' writes David Wheeler.

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