Describe the proposal
Add cosmological expansion (i.e., Hubble flow) terms to the equations of motion.
The easiest way to do this may be to adopt supercomoving coordinates (Martel & Shapiro 1997), although it's unclear whether this generalizes to beyond a gamma-law EOS.
Describe the proposal Add cosmological expansion (i.e., Hubble flow) terms to the equations of motion.
The easiest way to do this may be to adopt supercomoving coordinates (Martel & Shapiro 1997), although it's unclear whether this generalizes to beyond a gamma-law EOS.We can also adopt the trick used by FLASH to integrate the Friedmann equation exactly (https://flash.rochester.edu/site/flashcode/user_support/flash4_ug_4p71/node137.html), although the documentation does not reflect what the code actually does for this.
Describe alternatives you've considered Don't do cosmology.
Additional context This is needed for cosmological PopIII stars.
cc @psharda