Speaker: Naoki Yoshida

Title: The Distribution of Cosmic Relic Neutrinos in Six-Dimensional Phase Space

We present the state-of-the-art computer simulations of structure formation
in the Universe. The phase-space distribution of the cosmic relic neutrinos
is followed, for the first time, by directly integrating the six-dimensional collisionless
Boltzmann equation. Our novel approach allows us to reproduce free streaming and
clustering of neutrinos, and their gravitational interaction with cold dark matter
accurately. We perform a suite of hybrid Vlasov/N-body simulations with various
neutrino masses, and systematically examine the dynamical effects of massive
neutrinos on large-scale structure formation. Our simulations show characteristic
large-scale clustering of the neutrinos and their coherent streaming motions
relative to dark matter. The effective local neutrino ”temperature” around massive
galaxy clusters varies by several percent with respect the cosmic mean;
the neutrinos in clusters can be hotter or colder depending on the neutrino mass.
We study a number of statistics of the large- scale structure and of dark matter
halos in comparison with those obtained by conventional N-body simulations
and/or by perturbation theory.

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Last-modified: 2020-04-28 (火) 10:59:08 (67d)