Neutrino processes in partially degenerate neutron matter
| Autor: | Achim Schwenk, Albino Perego, Christopher J. Pethick, Sonia Bacca, Matthias Liebendörfer, K. Hally |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Particle physics Work (thermodynamics) Nuclear Theory 010308 nuclear & particles physics Degenerate energy levels FOS: Physical sciences Astronomy and Astrophysics Spin structure 01 natural sciences Nuclear Theory (nucl-th) Supernova High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Space and Planetary Science Phase (matter) 0103 physical sciences Effective field theory Neutron Neutrino Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics |
| Zdroj: | ASTROPHYSICAL JOURNAL |
| Popis: | We investigate neutrino processes for conditions reached in simulations of core-collapse supernovae. Where neutrino-matter interactions play an important role, matter is partially degenerate, and we extend earlier work that addressed the degenerate regime. We derive expressions for the spin structure factor in neutron matter, which is a key quantity required for evaluating rates of neutrino processes. We show that, for essentially all conditions encountered in the post-bounce phase of core-collapse supernovae, it is a very good approximation to calculate the spin relaxation rates in the nondegenerate limit. We calculate spin relaxation rates based on chiral effective field theory interactions and find that they are typically a factor of two smaller than those obtained using the standard one-pion-exchange interaction alone. 41 pages, 9 figures, NORDITA-2011-116; added comparison figures and fit function for use in simulations, to appear in Astrophys. J |
| Databáze: | OpenAIRE |
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