### Interacting dark-matter dark energy

Posted:

**April 15 2019**Hi,

I am new to CAMB. I never did any serious calculations using Fortran as I use Mathematica. This question may have already been asked, but I cannot find it. Please pardon me. I will be grateful if you help me out.

I have interacting dark matter dark energy perturbation equations in conformal Newtonian gauge. The EoS parameter for dark energy w_{de} is not a constant but depends on the redshift, z. Other background quantities are also evolving with redshift.

My questions are:

(a) Do I have to change my equations into the synchronous gauge?

(b) Do I need to change the GuageInterface module of equations.f90 for my equations?

(c) How do I incorporate the varying background in the code?

(d) Where do I put the initial conditions?

(e) How to do these if I want to use pyCAMB?

Thank you a lot in advance.

Srijita

I am new to CAMB. I never did any serious calculations using Fortran as I use Mathematica. This question may have already been asked, but I cannot find it. Please pardon me. I will be grateful if you help me out.

I have interacting dark matter dark energy perturbation equations in conformal Newtonian gauge. The EoS parameter for dark energy w_{de} is not a constant but depends on the redshift, z. Other background quantities are also evolving with redshift.

My questions are:

(a) Do I have to change my equations into the synchronous gauge?

(b) Do I need to change the GuageInterface module of equations.f90 for my equations?

(c) How do I incorporate the varying background in the code?

(d) Where do I put the initial conditions?

(e) How to do these if I want to use pyCAMB?

Thank you a lot in advance.

Srijita