No Time for Time from No-Time

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.

Presented at Philosophy of Science Association 2021 meeting

Cited by in corpus (3)

• Reassessing the problem of time of quantum gravity
• The birth of the Universe as a result of the change of the metric signature
• On the appearance of time in the classical limit of quantum gravity