"Quantum time dilation is a consequence of both quantum mechanics and Einstein's relativity, and thus offers a new possibility to test fundamental physics at their intersection." The new theory ...

In one such experiment, the lifetime of muon decay verifies the existence of time dilation. Stationary muons have a lifetime of about 2.2 microseconds.

And to illustrate the effect of time dilation, he proposed an example--the twin paradox--that is arguably the most famous thought experiment in relativity theory.

Now, a German facility has measured time dilation very accurately. But in a twist, these measurements were performed on things moving at just under 40 percent of the speed of light in the laboratory.

Particles produced by cosmic rays hitting Earth's atmosphere, called muons, have been proposed as an alternative to GPS navigation that would work underground - and now it has been tested for real ...