Emily Boudreaux
0571c63fad
This equation provides a constraint on central density through specific enthalpy (I think this is general so long as the eos can convert, though I wrote this for the barotropic case). This may need to be changed latter to be more general (though also generally we should not constrain central density). this is really there to deal with the specific non-rotating n=3 case where the central density is ill-defined due to a singularity.