How Neutrinos Test the Constancy of the Laws of Physics express
The speed of light in a vacuum is physics' metronome: it sets the rhythm for all processes. If it falters, the familiar harmony collapses. Neutrinos, ubiquitous but almost intangible particles from space, can check if this rhythm ever stumbles under extreme conditions. Future detectors like GRAND and POEMMA will catch neutrinos at the highest energies, where any deviation would appear brightest. If the constancy of the speed of light is violated, neutrino types will transform into each other differently: there will be an anomalously high number of tau neutrinos.
Calculations promise that the new facilities will catch a rhythm glitch tens of times fainter than any previous experiment. Astonishingly, even a microscopic violation of the law of Lorentz and Einstein would cause not just a slight off-key note but a true cacophony — detectors would be flooded by a shower of particles of a single kind. And then the music of the universe would sound entirely new. Or the rhythm will prove flawless, and we will once again confirm its harmony.
Neutrinos are so elusive that trillions of them pass through your fingernail every second, hardly noticing you.