Researchers led by the University of Warwick have created a single, practical roadmap for hunting “spacetime fluctuations,” the tiny random ripples that many quantum gravity ideas suggest could be woven into spacetime itself.
The possibility that spacetime is not perfectly smooth was raised decades ago by physicist John Wheeler. Since then, multiple leading approaches to quantum gravity have pointed to some form of underlying jitter. The problem is that these theories do not agree on the details. Different models imply different patterns of randomness, so experiments have not had a clear, shared target for what a real signal should look like.
In a new Nature Communications study, the team tackles that mismatch by organizing the possibilities into three broad classes based on how structured the fluctuations are across space and time. Instead of asking experimentalists to chase one specific theory, the framework starts from the mathematical description of a hypothesized fluctuation and works forward to what an instrument should measure.
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