The discussion revolves around the phenomenon of neutrinos arriving before light during a supernova event, exploring the mechanisms behind this timing and the implications of neutrino emission in the context of core-collapse supernovae.
Participants generally agree on the mechanism of neutrino emission occurring before light, but there are nuances in understanding the processes involved, and the discussion remains exploratory without a definitive consensus.
Participants reference the interaction of photons with the star's outer layers and the time it takes for energy generated in the Sun's core to reach its surface, indicating potential complexities in the mechanisms discussed.
Does seem backwards, doesn't it. Perhaps the mechanism of the supernova releases neutrinos before the visible explosion (implosion?) occurs?berkeman said:Sorry for the question, but why will the Neutrinos arrive slightly before the light from the supernova?
The answer is in the text of the linked article.berkeman said:Sorry for the question, but why will the Neutrinos arrive slightly before the light from the supernova?
Photons interact strongly with the ions and free electrons in the outer layers of the star, but neutrinos don't.Although the shock wave can take many hours to make it through the outer layers of the star and to become visible, neutrinos come out right away, practically at the speed of light. More than 99% of the energy from a core-collapse supernova escapes not as light, but as neutrinos.
Neutrinos come at the start - the neutronization phase. Light, and for that matter, antineutrinos, come over a longer period as short-lived nuclei decay.berkeman said:why will the Neutrinos arrive slightly before the light from the supernova?