Barontini’s Cold‑Atom Toy Universe Shows Time Emerge
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- Giovanni Barontini cooled ~20,000 rubidium atoms to near absolute zero and split them into “bright” and “dark” sectors, creating a toy universe in an ultracold‑atom lab.
- Barontini induced quantum atom exchange between the sectors, changing entropy and defining an internal time that matched predictions from the Schrödinger equation.
- Nevill Mott first suggested in the 1930s that time could emerge from quantum correlations, a concept later tested experimentally.
- Marco Genovese and his team demonstrated in 2013 that entangled photons can generate a sense of time, and he praised Barontini’s cold‑atom system for extending the idea to a more complex platform.
- Claus Kiefer linked the experiment to the broader challenge of unifying gravity and quantum theory, noting its relevance to quantum‑gravity research while acknowledging the toy model’s simplified interactions.
- Carlo Rovelli argued that such laboratory analogues cannot reveal new physics about time because they rely on known principles, but they may inspire approaches to unresolved quantum‑gravity problems.
Why it matters: The demonstration gives theoretical physicists a concrete platform to test emergent‑time hypotheses, potentially accelerating progress toward a unified quantum‑gravity framework, while also reminding the community that the model remains a simplified analog and may not capture the full complexity of cosmological time.
