PNG-UNITsims: Halo clustering response to primordial non-Gaussianities as a function of mass

Abstract

We present the largest full N-body simulation to date with local primordial non-Gaussianities (L-PNG), the \textsc{PNG-UNITsim}. It tracks the evolution of $4096^3$ particles within a periodic box with $L_{\mathrm{box}}=1h^{-1}\mathrm{Gpc}$, leading to a mass resolution of $m_p=1.24\times 10^9{h}^{-1}{M}_{\odot }$. This is enough to resolve galaxies targeted by stage-IV spectroscopic surveys. The \textsc{PNG-UNIT} has \textit{Fixed} initial conditions whose phases are also \textit{Matched} to the pre-existing \textsc{UNIT} simulation. These two features in the simulations reduce our uncertainty significantly so we use 100 \textsc{FastPM} mocks to estimate this reduction. The amplitude of the non-Gaussianities used to set the initial conditions of this new simulation is $f_{\mathrm{NL}}^{\mathrm{local}}=100$. In this first study, we use mass selected dark matter haloes from the \textsc{PNG-UNIT} simulation to constrain the local PNG parameters. PNG induce a scale dependent bias, parameterised through \bp or $p$, which might depend on the type of cosmological tracer. Those cases when $p=1$ are referred to as the {\it universality relation}. We measure $p$ as a function of the halo mass. Haloes with masses between $1\times 10^{12}$ and $2\times 10^{13}{h}^{-1}{M}_{\odot }$ are well described by the {\it universality relation}. For haloes with masses between $2\times 10^{10}$ and $1\times 10^{12}{h}^{-1}{M}_{\odot }$ we find that $p<1$ at $3\sigma$. Combining all the mass bins, we find $p$ consistent with a value of $0.955\pm 0.013$, which is $3\sigma$ away from \textit{universality}, as low mass haloes are more numerous. We also study the effect of using priors on $p$ when constraining $f_{\mathrm{NL}}$. Using the values we obtain for $b_{\varphi }$ as priors, we forecast that a DESI-like (stage-IV) survey will be able to constrain $f_{\mathrm{NL}}$ better than if the universality relation is assumed.

19 pages, 11 figures. Accepted for publication in A&A

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