AbacusPNG: A modest set of simulations of local-type primordial non-Gaussianity in the DESI era
arxiv(2024)
摘要
A measurement of a primordial non-Gaussianity (PNG) signal through late- or
early-Universe probes has the potential to transform our understanding of the
physics of the primordial Universe. While large-scale structure observables in
principle contain vital information, interpreting these measurements is
challenging due to poorly understood astrophysical effects. Luckily, N-body
simulations, such as the public AbacusPNG set presented in this study,
consisting of 9 boxes, each of size L_ box = 2 Gpc/h and particle
mass of 1.01 × 10^10 M_⊙/h, provide a viable path forward. As
validation, we find good agreement between the simulations and our expectations
from one-loop perturbation theory and the `separate universe' method for the
matter bispectrum, matter power spectrum and the halo bias parameter associated
with PNG, b_ϕ. As a science application, we investigate the link between
halo assembly bias and b_ϕ for halo properties known to play a vital role
in accurately predicting galaxy clustering: concentration, shear (environment),
and accretion rate. We find a strong response for all three parameters,
suggesting that the connection between b_ϕ and the assembly history of
halos needs to be taken into account by future PNG analyses. We further perform
the first study of the b_ϕ parameter from fits to early DESI data of the
luminous red galaxy (LRG) and quasi-stellar object (QSO) samples and comment on
the effect on f_ NL constraints for the allowed galaxy-halo models (note
that σ [f_ NL] ∝σ [b_ϕ]/b_ϕ). We find
that the error on f_ NL is 21, 6, 22 for the LRGs at z = 0.5 and z =
0.8 and QSOs at z = 1.4, respectively, suggesting that a thorough
understanding of galaxy assembly bias is warranted so as to perform robust
high-precision analysis of local-type PNG with future surveys.
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