Updated DM-ONLY power spectrum:

The gravitational constant was different from the one in Nyx at the 5th digit, here are the new results, max differences are 0.25%

Gas Temperature:

Cholla gravWork : The energy update is

Cholla deltaEk : The energy update is equal to the change in kinetic energy after the gravity update on the momentum.

Cholla uniform : Evolution of a uniform gas under adiabatic cosmological expansion, it follows the scaling expected for a gas.

Density - Temperature Slices:

Panel 1: Evolution with Nyx.

Panel 2: Evolution with Cholla using same initial conditions as Nyx using the change in kinetic energy for the energy update.

Panel 3: Evolution with Cholla using same initial conditions as Nyx using for the energy update.

Panel 4: Evolution with Enzo.

Panel 5: Evolution with Cholla using same initial conditions as Enzo using for the energy update.

Phase diagram: