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Elastic scattering in general relativistic ray tracing for neutrinos
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). North Carolina State University, USA.
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Number of Authors: 82018 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 98, no 10, article id 103014Article in journal (Refereed) Published
Abstract [en]

We present a covariant ray tracing algorithm for computing high-resolution neutrino distributions in general relativistic numerical spacetimes with hydrodynamical sources. Our formulation treats the very important effect of elastic scattering of neutrinos off of nuclei and nucleons (changing the neutrino's direction but not energy) by incorporating estimates of the background neutrino fields. Background fields provide information about the spectra and intensities of the neutrinos scattered into each ray. These background fields may be taken from a low-order moment simulation or be ignored, in which case the method reduces to a standard state-of-the-art ray tracing formulation. The method handles radiation in regimes spanning optically thick to optically thin. We test the new code, highlight its strengths and weaknesses, and apply it to a simulation of a neutron-star merger to compute neutrino fluxes and spectra, and to demonstrate a neutrino flavor oscillation calculation. In that environment, we find qualitatively different fluxes, spectra, and oscillation behaviors when elastic scattering is included.

Place, publisher, year, edition, pages
2018. Vol. 98, no 10, article id 103014
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Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-162793DOI: 10.1103/PhysRevD.98.103014ISI: 000450140700002OAI: oai:DiVA.org:su-162793DiVA, id: diva2:1274035
Available from: 2018-12-27 Created: 2018-12-27 Last updated: 2018-12-27Bibliographically approved

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O'Connor, Evan
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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