Table of Contents
Universe, Volume 5, Issue 3 (March 2019)
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Cover Story (view full-size image) Supposing that cosmological time is a quantum observable that does not commute with other quantum [...] Read more. Supposing that cosmological time is a quantum observable that does not commute with other quantum operators essential for the definition of cosmological states—notably the cosmological constant—then, the Universe may be "delocalized" in time: it does not know the time, a property which opens up new cosmological scenarios. It would also invalidate several paradoxes, such as the timelike tower of turtles associated with an omnipresent timeline. Alternatively, a Universe with a sharply defined clock time must have an indeterminate cosmological constant. The challenge then is to explain how islands of localized time may emerge and give rise to localized histories. View this paper.