2017/12/31 by Titouan Lazeyras, Fabian Schmidt · 2 citations
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.1088/1475-7516/2018/09/008
published as JCAP 09 (2018) 008 · 29 pages, 12 figures; v2: new renormalization procedure, added figure 12, results at higher redshifts on figs 1-5, added appendix B, C and F, clarifications throughout; v3: clarifications throughout, version accepted by JCAP
arxiv created 2018/09/10 · arxiv updated 2018/09/19
We present direct measurements of cubic bias parameters of dark matter halos from the halo-matter-matter-matter trispectrum. We measure this statistic efficiently by cross-correlating the halo field measured in N-body simulations with specific third-order nonlocal transformations of the initial density field in the same simulation. Together with the recent Abidi & Baldauf (2018), these are the first measurements of halo bias using the four-point function that have been reported to date. We also obtain constraints on the quadratic bias parameters. For all individual cubic parameters involving the tidal field Kij, we find broad consistency with the prediction of the Lagrangian local-in-matter-density ansatz, with some indications of a positive Lagrangian coefficient b\rm tdL multiplying the time derivative of Kij. For the quadratic tidal bias (bK2), we obtain a significant detection of a negative Lagrangian tidal bias.