The past and future are tightly linked in conventional quantum mechanics. A tweak could let quantum possibilities increase as space expands.
“There are some configurations of the future that don’t correspond to anything in the past,” Cotler said. “There’s nothing in the past that would evolve into them.”
Giddings thinks the approach deserves further development. So does Dittrich, who came to similar realizations about isometry a decade ago while attempting to formulate awith her collaborator Philipp Höhn. One hope is that such work could eventually lead to the specific isometric rule that might govern our universe—a rather more complicated prescription than “0 goes to 01.
Another prize would be a detailed quantum theory that described not just how the cosmos grows, but where everything came from in the first place. “We have no universe, and all of a sudden we have a universe,” Arkani-Hamed said. “What the hell kind of unitary evolution is that?”
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