Precision calculation of with Neutrino Direct Simulation Monte Carlo
arXiv:2508.08379 · doi:10.1103/21gr-4xgd
Abstract
Neutrino Direct Simulation Monte Carlo (DSMC) is a Monte Carlo method for solving the neutrino Boltzmann equation in the early Universe, designed to track the evolution of cosmic neutrinos across a wide range of cosmological scenarios. We develop a complete DSMC solver that consistently incorporates the effects of the electron mass, three-flavour neutrino oscillations, and finite-temperature QED corrections to the thermodynamics of the electromagnetic plasma. As a first application, we perform a high-precision calculation of neutrino decoupling in the standard cosmological model and obtain , in excellent agreement with state-of-the-art results.
arXiv commentVersion accepted for publication in Phys.Rev.D
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