The Distribution of Cosmic Neutrino Background on the Surface of the Earth

Explore the fascinating world of the Cosmic Neutrino Background (CNB) in this illuminating physics colloquium talk. Delve into how the Earth significantly alters the local distribution of relic neutrinos and antineutrinos, creating a unique phenomenon near the planet's surface. Discover the intriguing behavior difference between neutrinos and antineutrinos, with the former being repelled and the latter attracted to Earth. Learn about the resulting relative over-density of neutrinos close to the Earth's surface, which enhances the primordial neutrino-antineutrino asymmetry by a factor of 100,000. Understand the significance of the 7-meter band around the Earth where this enhancement persists, determined by the evanescent wave scale for neutrinos. Gain insights into how these findings open up new possibilities for detecting elusive relic neutrinos in laboratory settings, potentially unlocking a wealth of information about the early Universe and the neutrino sector from when the cosmos was less than a second old.