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CG: Pairwise velocities in the strongly nonlinear regime of large-scale structures – Garcia-Farieta
April 20, 2022 @ 12:15 pm - 12:30 pm
We perform a systematic validation of the models of the pairwise velocities of galaxies based on the pair conservation of cosmic tracers. The equation that governs the dynamics of pairwise motions is derived from the BBGKY hierarchy and solved numerically in the strongly nonlinear regime of large scale structures. We analyze the complete solution of this equation with the prediction of the convolved Lagrangian perturbation theory approach and with approximated expressions where the pairwise velocity is proportional to the two-point correlation function scaled by the structure factor. Finally, we compared our results with the velocity statistics obtained from N-body simulations and analyzed the time-dependence and the effect of tracer bias on the pairwise velocities.