A quantitative analysis of the effect of box size in N-body simulations of the matter power spectrum

2024/01/26 by Eingorn, Maxim, Yilmaz, Ezgi, Yükselci, A. Emrah +1
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)

paper · doi:10.48550/arxiv.2401.15214

Abstract

We study the effect of box size on the matter power spectrum obtained via cosmological N-body simulations. Within the framework of the cosmic screening approach, we show that the relative deviation between the spectra for our largest comoving box with L = 5632 Mpc/h and those for L = 280, 560, 1680, 4480, 5120 Mpc/h boxes consistently increases with decreasing box size in the latter set in the redshift range 0≤ z≤ 80 for the considered values. As an additional demonstrative example, at redshift zero, we determine the values k_1% corresponding to the modes at which relative deviations reach 1%.

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