Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........83k&link_type=abstract
Thesis (PH.D.)--AUBURN UNIVERSITY, 1990.Source: Dissertation Abstracts International, Volume: 52-07, Section: B, page: 3661.
Astronomy and Astrophysics
Astrophysics
Scientific paper
We have calculated the current generation rate due to the scattering of neutrinos off charged particles in a supernova plasma with temperature and density gradients and differential rotation. The motivation for the present work is to understand the potential effect of the magnetic field generated by the neutrino scattering off charged particles on the supernova explosion. For a long time, this phenomenon has been difficult to explain, despite the efforts of many theoretical astrophysicists. Earlier workers have found that magnetic fields of more than 10 15 Gauss are needed in the supernova explosion. Our results show that the generated magnetic field is large enough (exceeding 10 20 Gauss, provided no nonlinear effects set in, as compared with the estimated value above) to help the supernova explosion. The time scale of the acceleration of electrons by the scattering of neutrinos (10^{-2} -10^{-3} sec) is comparable to the times scale of the gravitational collapse (10 ^{-2}-10^{-3} sec). The results also show that electrons contribute dominantly to the current generation rate. This fact led us to investigate the deceleration of electrons by heavy ions through Coulomb interaction. Our results show that the Coulomb relaxation process is inefficient because electron degeneracy suppresses the deceleration of electrons. Therefore, the current generation is still effective and the generated magnetic field is large enough to affect the supernova explosion. The finding of a source of a strong magnetic field suggests further study of the processes in the nonlinear regime. The nonlinear processes include the effect of the magnetic field on the current generation process (dynamo process); the effect of the magnetic field on the differential rotation (transport process of angular momentum), which is an essential part of the current drive; and the effect of the magnetic field on the buoyancy instability and subsequent convective motion of infalling material. Our present investigation is a modest starting point for a more sophisticated study of various nonlinear dynamics of supernova plasma.
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