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This research utilizes an ultracold atomic ensemble to simulate cosmological expansion and collapse, demonstrating that time can be defined internally by entropy changes rather than external clocks. The experiment provides a novel testbed for theories in quantum gravity and the early universe without relying on conventional laboratory timing standards.

Sursă care acoperăQuantum Zeitgeist

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24,000 Atoms Build ‘Mini-Universe’ to Measure Time Without Clocks

Quantum Zeitgeist13 iunie 20265 min de cititArticolul și perspectiva sunt în engleză.

Using 24,000 ultracold rubidium atoms, a University of Birmingham scientist modeled a ‘mini universe’ to measure time—without a clock.

A system built from 24,000 ultracold atoms is challenging fundamental assumptions about the nature of time, according to new research from the University of Birmingham. Professor Giovanni Barontini and colleagues constructed the quantum system, cooled to just a few billionths of a degree above absolute zero, to mimic the expansion and collapse of a cosmos, creating a “bright” and “dark” region with laser beams. The experiment demonstrated the ability to measure the flow of time within the system itself, without relying on an external laboratory clock, revealing that “time”…

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