Here is the comparison for Cholla simulations using different UV Backgrounds:

The simulations are 256\(^3\) cells/particles on a 50 Mpc/h box.

The cosmological parameters, Plank 2018:

\(H_0 = 67.66\)
\(\Omega_\Lambda = 0.6889\)
\(\Omega_m = 0.3111\)
\(\Omega_b = 0.0497\)
\(\sigma_8 = 0.8102\)
\(n_s = 0.9665\)

UVB Tables:

HM12_Grackle: Original table for HM12 model, included with Grackle.

HM12_Cloudy: Recomputed table for HM12 model, computed with Cloudy C17.

Puchwein18_Cloudy: Table for Puchwein18 model, computed with Cloudy C17.

Phase Diagram

The phase diagram as a function of redshift for the three cases:

Average Temperature

The mass weighted average temperature as a function of redshift for the three cases:

Ionization Fraction

The ionization fractions for H and He separately as a function of redshift for the three cases: