http://arxiv.org/abs/2111.02240
This paper presents a perturbative treatment of non-linear clustering in the context of the cubic Galileon modified gravity model. We numerically implement the modified gravity version of 2nd order Lagrangian perturbation theory in the PINOCCHIO code, as well as an extension of ellipsoidal collapse that includes Vainshtein screening. We then use the extended code to generate realizations of the matter density field and halo catalogs according to the PINOCCHIO algorithm, and compute the matter power spectrum and halo mass function, studying different approximations for the computation of collapse times. The enhancement in the matter power spectrum with respect to the standard LambdaCDM model gradually appears in the small scales when the redshift is z<1, with a maximum relative difference to LambdaCDM of about 23% at k=1/Mpc and z=0. We find that the Vainshtein screening mechanism in PINOCCHIO is less efficient than the one in N-body simulations, due to a different definition of collapse time. In the halo mass function, the modified gravity effect is larger in the high mass end, similarly to what is found for other modified gravity models. Our code is publicly available in a dedicated branch, dubbed “G3-PINOCCHIO”.
Y. Song, C. Moretti, P. Monaco, et. al.
Thu, 4 Nov 21
17/73
Comments: N/A