Researchers from the University of Warsaw in Poland and University of Nottingham in UK showed that in systems moving with enormous accelerations, building a clock that would precisely measure the passage of time is impossible for fundamental reasons.
"In both theories of relativity, special and general, it is tacitly assumed that it is always possible to construct an ideal clock - one that will accurately measure the time elapsed in the system, regardless of whether the system is at rest, moving at a uniform speed, or accelerating," said Andrzej Dragan from the Faculty of Physics, University of Warsaw.
"It turns out, however, that when we talk about really fast accelerations, this postulate simply cannot apply," said Dragan. The simplest clocks are unstable elementary particles, for example muons (particles with similar properties to electrons but 200 times more massive).

"Our calculations showed that above certain very large accelerations there simply must be time disorders in the decay of elementary particles," said Dragan.
If the disturbances affect fundamental clocks such as muons, then any other device built on the principles of quantum field theory will also be disrupted, he said.
"Therefore, perfectly precise measurements of proper time are no longer possible," said Dragan. The study was published in the journal Classical and Quantum Gravity.



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