The weak interaction and gravitational collapse

Physics

Scientific paper

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Gravitational Collapse, Neutrinos, Stellar Evolution, Supernovae, Astronomical Models, Cosmic Rays, Electron Capture, Heavy Elements, Interstellar Matter, Momentum Transfer, Particle Interactions

Scientific paper

Recent developments in weak-interaction physics as well as a more careful examination of previously known phenomena should yield a much clearer picture of the gravitational collapse of an evolved stellar core than has previously been possible. It is shown that the dominant neutrino-emitting process throughout much of the collapse is ordinary electron capture. The effects of neutral currents and the coherent scattering of neutrinos is discussed. A modified neutrino transport supernova model, whereby momentum transfer from neutrino scattering blows off the outer part of a star while leaving a dense remnant, may be quite resonable. The boundary between collapse and ejection is near a region with a density of about 2 by 10 to the 11th power g/cu cm. Possible implications for origin of the cosmic rays and the heavy elements in the interstellar medium are discussed.

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