“Foam of space-time” does not slow down neutrinos: they move at the speed of light

Intergalactic race between the light and the bizarre subatomic particles, called neutrinos, ended in a draw. It suggests that high-energy neutrinos, which are so light that act like you have no mass, followed by a basic rule of physics: massless particles move at the speed of light.

Comparing the arrival time of neutrinos and related flashes of high-energy light emitted by the bright, flashing galaxy, the scientists saw that the velocities of neutrinos and of light separated by less than one billionth of a percent. This became known from a paper published last week in arXiv.org.

Neutrinos move faster than light?

Massless particles, including particles of light, known as photons — are moving consistently at speeds of almost 300,000 kilometers per second, whereas massive particles are moving much slower. Although neutrinos have a mass, it is so infinitely small that high-energy neutrinos move at speeds almost indistinguishable from the light.

Some theories suggest that the “foam of space-time” would slow the particles to very high energies. The idea that space-time at extremely small scales is not smooth, and frothy. As a result of high-energy particles could get caught up in it, like moving through the Styrofoam. This effect could lead to a substantial difference between the velocities of neutrinos and of light, which would have resulted in a delay in the arrival of neutrinos from the distance of 4 billion light years to Earth. But as the flash of light was seen almost simultaneously with the neutrino, there are no reasons for no differences.

This result once again refutes the assertion in 2011 that neutrinos can travel faster than light. In that year, the measurement performed by the particle detector OPERA has been distorted loose cable.

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