Fitting the Nonlinear Matter Bispectrum by the Halofit Approach
作者： Issha Kayo , Atsushi Taruya , Atsushi Taruya , Ken Osato , Ryuichi Takahashi
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摘要: We provide a new fitting formula of the matter bispectrum in nonlinear regime calibrated by high-resolution cosmological $N$-body simulations $41$ cold dark ($w$CDM, $w=$ constant) models around Planck 2015 best-fit parameters. As parameterization our function is similar to that Halofit, named BiHalofit. The simulation volume sufficiently large ($> 10 \, {\rm Gpc}^3$) cover almost all measurable triangle configurations universe. also using one-loop perturbation theory at scales ($k<0.3 h Mpc}^{-1}$). Our reproduced within $10 (15) \%$ accuracy model wavenumber $k< 3 (10) Mpc}^{-1}$ and redshifts $z=0-3$. other $40$ $w$CDM obtained poorer fits, with approximating $20 $k<3 $z=0-1.5$ (the deviation includes \%$-level sample variance simulations). corrects baryonic effects such as radiative cooling active galactic nucleus feedback, latest hydrodynamical IllustrisTNG. demonstrate more accurately predicts weak-lensing than existing formulas. This will assist current future surveys cosmic microwave background lensing experiments. Numerical codes are available, written Python, C Fortran.
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