Sensitivity tests of cosmic velocity fields to massive neutrinos

We investigate impacts of massive neutrinos on the cosmic velocity fields, employing high-resolution cosmological $N$-body simulations provided by information-optimized CUBE code, where are evolved using collisionless hydrodynamics and their perturbations can be accurately resolved. In this study we focus, for first time, analysis massive-neutrino induced suppression effects in various field components magnitude, divergence, vorticity dispersion. By varying neutrino mass sum $M_\nu$ from 0 -- 0.4 eV, show that, power spectra exclusively sourced non-linear structure formation that is affected significantly very sensitive to sum, which potentially provide novel signatures detecting neutrinos. Furthermore, chi-square statistic, quantitatively test sensitivity density sum. Indeed, find spectrum has highest sensitivity, null hypothesis massless incompatible with both divergence $M_\nu=0.1$ eV at high significance ($p$-value $= 0.03$ $0.07$, respectively). These results demonstrate clearly importance peculiar measurements, particular components, determination hierarchy.