Interacting dark-matter dark energy

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
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srijita sinha
Posts: 11
Joined: April 12 2019
Affiliation: Indian Institute of Science Education and Research Kolkata

Interacting dark-matter dark energy

Post by srijita sinha » 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

Antony Lewis
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Joined: September 23 2004
Affiliation: University of Sussex
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Re: Interacting dark-matter dark energy

Post by Antony Lewis » April 16 2019

a,b: yes. c and d are also implemented in equations.f90.

Once you have modified the fortran, using the python version should be straightforward, you'll just need to add any new parameters to CAMBparams in both fortran and the python wrapper.

srijita sinha
Posts: 11
Joined: April 12 2019
Affiliation: Indian Institute of Science Education and Research Kolkata

Re: Interacting dark-matter dark energy

Post by srijita sinha » April 26 2019

Thanks a lot, Sir. I want to apologise in advance for the dumb question.

I managed to implement (a), (b) and (d). But cannot understand how and where to implement (c).
For reference: I want to implement Eq. No. 2.20 and 2.21 of https://arxiv.org/abs/1204.6135. I want to know how do I change the CAMB for the Interacting Holographic models there.

I am sorry if this has been already discussed and I missed it.

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