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Events on Tuesday, September 28th, 2021

Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar
Impact of EoS on Neutrino Opacities in Core-collapse Supernovae
Time: 2:00 pm
Place: https://berkeley.zoom.us/j/99464252867
Speaker: Zidu Lin , University of Tennessee Knoxville/ORNL
Abstract: Neutrinos radiate 99% of the energy and play a crucial role in the explosion mechanism and nucleosynthesis of core-collapse supernovae. The neutrino interactions in hot and dense matter is a complex problem due to bound nuclei and the strong nuclear forces. In this work we calculate the dynamic and static response of the neutral current and charged current neutrino-nucleon interactions, from low-density region near the neutrino sphere to high-density region up to approximately 1.5 saturation densities at finite T, by applying random phase approximation (RPA). We emphasize on the consistency between an equation of state (EoS) and the neutrino opacity, by using the density-dependent residual interactions, effective mass, single nucleon potentials directly derived from an EoS which matches experiment, theory, and observation in various density regimes. We further analyze the effect of EoSs on neutrino opacities by calculating the statistical uncertainties of neutrino opacities. We found that our neutral current static response based on RPA is close to the results from model-independent virial approximation at low density, and our description of neutrino opacities at high densities have large uncertainties due to still unclear strong (especially spin-dependent) nuclear forces.
Host: Baha Balantekin
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Theory Seminar (High Energy/Cosmology)
Title to be announced
Time: 4:00 pm
Place: Chamberlin 5280
Speaker: George Wojcik, University of Wisconsin-Madison
Abstract: Note: This is a hybrid event. A zoom link will be distributed via the seminar mailing list. To join, email the organizer.
Host: Lars Aalsma
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