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This experiment successfully orders events within a Bose-Einstein condensate using only internal degrees of freedom across 44 cycles of expansion and recollapse. By constructing an entropic time metric from coarse-grained entropy, the study provides a controlled platform for testing relational-time theories relevant to quantum gravity without relying on external parameters. These findings advance our understanding of how fundamental concepts like time might emerge purely from system dynamics in ultracold atomic gases.

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Bose-Einstein Condensate Evolves Across 44 Cycles of Recollapse

Quantum ZeitgeistJune 14, 20263 min read

A Bose-Einstein condensate was studied to investigate how dynamics can be ordered using only internal characteristics, motivated by approaches to the problem of time in quantum gravity. Researchers demonstrated an entropic time ordering events within the condensate, even through repeated expansion and recollapse cycles.

Researchers at the University of Birmingham have demonstrated a novel approach to understanding the fundamental nature of time by observing cycles of expansion and recollapse in a Bose-Einstein condensate. The experiment partitioned the ultracold gas using a thin optical barrier, creating “observed” and “unobserved” sectors designed to mirror concepts within the Wheeler-DeWitt framework and relational-time theories. By constructing an entropic time from…

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