The Unruh effect (named after Canadian physicist W. G. Unruh) is a theoretical prediction about temperature gains for a theoretical accelerating observer in a vacuum.
[…] in layman's terms, an accelerating thermometer (like one being waved around) in empty space, removing any other contribution to its temperature, will record a non-zero temperature, just from its acceleration.
Source : Wikipedia
The theoretical possibilities have been studied from 1973, and few quantum physicists dispute the possibility.
To date, however, there is no experimental evidence that the effect is real.
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