Improving initialization and evolution accuracy of cosmological neutrino simulations

Understand

Neutrino mass constraints are a primary focus of current and future large-scale structure (LSS) surveys.

• Non-linear LSS models rely heavily on cosmological simulations -- the impact of massive neutrinos should therefore be included in these simulations in a realistic, computationally tractable, and controlled manner.
• A recent proposal to reduce the related computational cost employs a symmetric neutrino momentum sampling strategy in the initial conditions.
• We implement a modified version of this strategy into the Hardware/Hybrid Accelerated Cosmology Code (HACC) and perform convergence tests on its internal parameters.