Argüelles and his colleagues reviewed two years' worth of neutrino data collected by the IceCube Observatory. Their search yielded no evidence of Lorentz violation in the realm of high-energy neutrinos. "This closes the book on the possibility of Lorentz violation for a range of high-energy neutrinos, for a very long time," study co-author Janet Conrad, a physicist at MIT, said in a statement. [Einstein Quiz: Test Your Knowledge on the Physics Genius]

This outcome allowed the researchers to calculate that anything that interreacts with neutrinos at an energy level greater than 10 raised to the minus 36 gigaelectron volts (GeV) squared, seems to obey the normal rules for neutrino oscillations — meaning that Lorentz symmetry still works as expected. To put that in perspective, infinitesimally small neutrinos interact with matter at an energy level of about 10 raised to the minus 5 GeV squared, which is still incredibly weak but is 10 nonillion times bigger than this new limit.

"We were able to set the most stringent limit yet on how strongly neutrinos may be affected by a Lorentz-violating field," said Conrad.   

Neutrinos had not yet been discovered when Einstein died, but his theory still predicts their behavior, "which is amazing," said Argüelles. "So far, we have found no evidence that there is a problem with Einstein's theory of space-time relativity," he said.

Nonetheless, Argüelles and his colleagues plan to continue exploring higher-energy phenomena for instances of Lorentz violation. "As you explore new conditions, you may find things that were not important are now important," he said.