Latin-hypercubes

Quijote provides several latin-hypercubes that can be classified into two main categories depending on whether they include massive neutrinos:

LH

The simulations in this category only consider massless neutrinos. There are three latin-hypercubes in this category, each containing 2,000 simulations that vary the value of \(\Omega_{\rm m}\), \(\Omega_{\rm b}\), \(h\), \(n_s\), \(\sigma_8\). The limits of the latin-hypercubes are set by:

\[\begin{split}\Omega_{\rm m} \in [0.1 ; 0.5]\\ \Omega_{\rm b} \in [0.03 ; 0.07]\\ h \in [0.5 ; 0.9]\\ n_s \in [0.8 ; 1.2]\\ \sigma_8 \in [0.6 ; 1.0]\end{split}\]

The value of the cosmological parameters for each simulation of a latin-hypercube of this category can be found here. Alternatively, inside each snapshot folder, there is a file called Cosmo_params.dat that contains the value of the cosmological parameters of that simulation. Each simulation of the latin-hypercube has a different value of the initial random seed. The value of the initial random seed of each simulation is written in the file ICs/2LPT.param inside each simulation folder.

The differences between the three latin-hypercubes are these:

standard: This latin-hypercube contains 2,000 standard simulations with \(512^3\) particles each. The snapshots, halo catalogues…etc of this latin-hypercube are located in a folder called latin_hypercube. The folder names are X, where X goes from 0 to 1999.
fixed: This latin-hypercube contains 2,000 fixed simulations with \(512^3\) particles each. The snapshots, halo catalogues…etc of this latin-hypercube are located in a folder called latin_hypercube. The folder names are NCV_X where X goes from 0 to 1999.
high-resolution. This latin-hypercube contains 2,000 standard simulations with \(1024^3\) particles each. The snapshots, halo catalogues…etc of this latin-hypercube are located in a folder called latin_hypercube_HR. The folder names are X, where X goes from 0 to 1999.

Note

The simulations in the standard and high-resolution latin-hypercubes share the same initial random seed. E.g. the simulation 723 of the standard latin-hypercube has the same initial random seed as the simulation 723 of the high-resolution latin-hypercube. The only difference is the maximum \(k\) sampled in each.

nwLH

The simulations in this category include massive neutrinos. There is one single latin-hypercube in this category, and it contains 2,000 simulations that vary the value of \(\Omega_{\rm m}\), \(\Omega_{\rm b}\), \(h\), \(n_s\), \(\sigma_8\), \(M_\nu\), and \(w\). The limits of this latin-hypercube are set by

\[\begin{split}\Omega_{\rm m} \in [0.1 ; 0.5]\\ \Omega_{\rm b} \in [0.03 ; 0.07]\\ h \in [0.5 ; 0.9]\\ n_s \in [0.8 ; 1.2]\\ \sigma_8 \in [0.6 ; 1.0]\\ M_\nu \in [0.01 ; 1.0]~{\rm eV}\\ w \in [-1.3 ; -0.7]\end{split}\]

The value of the cosmological parameters of each simulation of the latin-hypercube can be found here. Alternatively, inside each snapshot folder, there is a file called Cosmo_params.dat that contains the value of the cosmological parameters of that simulation. Each simulation of the latin-hypercube has a different value of the initial random seed. The value of the initial random seed of each simulation is written in the file ICs/NGenIC.param inside each simulation folder.

Note

Note that the initial conditions of these simulations have been generated using the Zel’dovich approximation, while the initial conditions of latin-hypercubes that do not include neutrinos were generated using 2LPT.

The snapshots, halo catalogues…etc of this latin-hypercube are located in a folder called latin_hypercube_nwLH. The folder names are X, where X goes from 0 to 1999.