Thesis and Dissertation Defenses
Collective Neutrino Flavor Oscillations in Multiple Dimensions and Scales
Presented by Joshua D. Martin
In extreme events involving the formation of compact objects such as core collapse supernovae (CCSNe) and binary neutron star mergers, neutrinos are emitted in such large quantities that the neutrino gas can experience a self-coupling induced by coherent forward scattering between neutrinos. This nonlinear self-coupling subsequently results in correlation forming between neutrinos on different trajectories. In early one dimensional studies it was observed that the neutrino self-interaction results in surprising large scale coherence and collective oscillation behavior, but later studies showed that when strict symmetry impositions are relaxed that this coherence can be lost. In this talk I will focus on two stationary 2D models and one dynamic 1D model which are relevant to CCSNe explosions. I will demonstrate that the loss of correlation seen in early stationary 2D studies should not be universally expected. I will also utilize the 1D dynamic model to demonstrate that in regions of high neutrino number density, coherent flavor conversion can occur and can transport electron lepton number out of the proto-neutron star.
2:00 pm, Tuesday, April 7, 2020
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