Quintessence module

[Mohamad Arab]

Dear all,

I have a question about the default oscillating quintessence module introduced in DarkEnergyQuintessence.90. If I want to use this module in CosmoMC, is it necessary to define a constraint relationship among the density elements at present, considering the parameters of the model used in CosmoMC?

For example, would it look something like this: parameter_1 = 1 - {Func(parameter_2)+ Sum(Omega_i)}?

I understand that the relationship is included in the file cosmologyParametrization.f90, specifically with the equation: CMB%omv = 1 - CMB%omk - CMB%omb - CMB%omdm. However, for quintessence, is it necessary to establish a new constraint relation in CAMB to define a new parameter space? Or should I use these parameters independently to make extended parameter space?

I have modified the file for my model but to use it for CosmoMC I am unsure how to do that.

I hope I have explained my issue clearly.
Thank you

[Antony Lewis]

I don't think so, in CAMB normally omv calculated from density parameters and you just need to make sure your model gives an energy density today consistent with that. I've not thought about CosmoMC context.