Quantum Closures for Neutrino Moment Transport
A computationally efficient method for calculating the transport of neutrino flavor in simulations is to use angular moments of the neutrino one-body reduced density matrix, i.e., `quantum moments'. As with any moment-based radiation transport method, a closure is needed if the infinite tower o...
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Main Authors | , , , , , |
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Format | Journal Article |
Language | English |
Published |
01.10.2024
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Subjects | |
Online Access | Get full text |
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Summary: | A computationally efficient method for calculating the transport of neutrino
flavor in simulations is to use angular moments of the neutrino one-body
reduced density matrix, i.e., `quantum moments'. As with any moment-based
radiation transport method, a closure is needed if the infinite tower of moment
evolution equations is truncated. We derive a general parameterization of a
quantum closure and the limits the parameters must satisfy in order for the
closure to be physical. We then derive from multi-angle calculations the
evolution of the closure parameters in two test cases which we then
progressively insert into a moment evolution code and show how the parameters
affect the moment results until the full multi-angle results are reproduced.
This parameterization paves the way to setting prescriptions for genuine
quantum closures adapted to neutrino transport in a range of situations. |
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Bibliography: | N3AS-24-035 |
DOI: | 10.48550/arxiv.2410.00719 |