Based on local information about opacities, the algorithm figures out an escape route that tends to minimize the optical depth without assuming any predefined paths for radiation. Motivated by (but not limited to) neutrino transport in three-dimensional simulations of core-collapse supernovae and neutron star mergers, our method makes no assumptions about the geometry of the matter distribution, apart from expecting optically transparent boundaries.
We introduce the multidimensional optical depth algorithm (MODA) for the calculation of optical depths in approximate multidimensional radiative transport schemes, equally applicable to neutrinos and photons.
2, 64289 Darmstadt, GermanyĮ-mail: The Oskar Klein Center, Department of Astronomy, AlbaNova, Stockholm University, 106 91 Stockholm, Swedenģ Department of Physics, University of Basel, Klingelbergst.
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