Philosophy of Science (forthcoming)

Authors
Eugene Chua
University of California, San Diego
Craig Callender
University of California, San Diego
Abstract
Programs in quantum gravity often claim that time emerges from fundamentally timeless physics. In the semiclassical time program time arises only after approximations are taken. Here we ask what justifies taking these approximations and show that time seems to sneak in when answering this question. This raises the worry that the approach is either unjustified or circular in deriving time from no–time.
Keywords philosophy of physics, emergence of spacetime, canonical quantum gravity, approximations, WKB, Born-Oppenheimer, decoherence
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