http://arxiv.org/abs/1705.08165
The effect of massive neutrinos on the growth of cold dark matter perturbations acts as a scale-dependent Newton’s constant and leads to scale-dependent growth factors just as we often find in models of gravity beyond General Relativity. We show how to compute growth factors for $\Lambda$CDM and general modified gravity cosmologies combined with massive neutrinos in Lagrangian perturbation theory for use in COLA and extensions thereof. We implement this together with the grid-based massive neutrino method of Brandbyge and Hannestad in MG-PICOLA and compare COLA simulations to full N-body simulations of $\Lambda$CDM and $f(R)$ gravity with massive neutrinos. Our implementation is computationally cheap if the underlying cosmology already has scale-dependent growth factors and it is shown to be able to produce percent level accurate results for the matter power-spectrum up to $k\lesssim 1 h/$Mpc.
B. Wright, H. Winther and K. Koyama
Wed, 24 May 17
52/70
Comments: 26 pages, 14 figures
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