Parent Simulation

Initial Conditions
First we constructed a parent simulation of sufficient size to include thousands of Milky Way sized systems but also of sufficient resolution to construct good Lagrangian volumes. We decided on ~10,000 particles per Milky Way-sized host and a 100 Mpc/h volume. Our level_max=10 , which means our parent simulation’s effective resolution is (2^10)^3 = 1024^3, i.e. a parent particle mass,
mp=8.72×107M⊙m_p = 8.72 \times 10^7 M_\odotmp​=8.72×107M⊙​
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# parentics.conf
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[setup]
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boxlength               = 100
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zstart                  = 127
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levelmin                = 10
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levelmin_TF             = 10
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levelmax                = 10
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padding                 = 8
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overlap                 = 4
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ref_center              = 0.5, 0.5, 0.5
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ref_extent              = 0.2, 0.2, 0.2
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align_top               = yes
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baryons                 = no
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use_2LPT                = no
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use_LLA                 = no
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periodic_TF             = yes
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​
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[cosmology]
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Omega_m                 = 0.3175
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Omega_L                 = 0.6825
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Omega_b                 = 0.049
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H0                      = 67.11
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sigma_8                 = 0.8344
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nspec                   = 0.9624
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transfer                = eisenstein
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​
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[random]
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seed[10]                = 34567
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​
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[output]
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format                  = gadget2
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filename                = ./ics
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gadget_num_files        = 128
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​
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[poisson]
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fft_fine                = yes
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accuracy                = 1e-5
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pre_smooth              = 3
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post_smooth             = 3
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smoother                = gs
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laplace_order           = 6
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grad_order              = 6
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