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Neutrino Production and Transport during Gravitational Collapse


Bond, John Richard (1979) Neutrino Production and Transport during Gravitational Collapse. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/mty2-sm41.


The P-N method is developed to describe the transport of neutrinos in collapsing stellar cores, and the multigroup flux limited diffusion and equilibrium diffusion approximations are obtained from it. An effective Lagrangian for weak neutral and charged current neutrino interactions which is applicable to low energy neutrino processes is derived. The neutrino source functions which enter into the P-N equations are given a many body theory formulation in terms of weak current-current correlation functions. Within this framework, we deal, in turn, with the scattering reactions νA → νA, νA → νA*, νN → νN (both for non-degenerate and degenerate nucleons), νe → νe, and νν → νν, and the production and absorption reactions e-p ⇄ nνe, e+n ⇄ pν̅e, e-AZ ⇄ A(Z-1) νe, e+e- ⇄ νν̅, and γpℓ ⇄ νν̅. These equations are then applied to the various phases of neutrino flow during iron core collapse: the transparent stage to the onset of trapping; the approach of electron neutrinos to beta-equilibrium; the evolution of the muon neutrino and antineutrino distribution functions towards the Fermi-Dirac form; the conditions under which νµ ν̅µ radiative energy loss exceeds the νe loss; comparison of the P-1 and flux limited diffusion methods of spatial transport in a static pre-bounce core.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Fowler, William A.
Thesis Committee:
  • Fowler, William A.
Defense Date:18 July 1978
Funding AgencyGrant Number
Record Number:CaltechTHESIS:10062016-102636623
Persistent URL:
Bond, John Richard0000-0003-2358-9949
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9936
Deposited By: Benjamin Perez
Deposited On:06 Oct 2016 18:46
Last Modified:19 Apr 2021 22:26

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