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Running different Dark energy parameterisation
 
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ruchika kaushik



Joined: 06 Dec 2017
Posts: 5
Affiliation: research scholar

PostPosted: February 04 2018  Reply with quote

By adding param[w] and param[wa] with its appropriate prior, cosomomc will run for w0waCDM. But now I want to change the equation of state to some other dark energy parameterization, say 7CPL. Where 7CPL equation of state is defined as,
w(a) = w0 + wa (1-a)7
I found the definition of equation of state at line 1916
Code:
w_de_hm=cosm%w+(1.-a)*cosm%wa

in halo_ppf.f90. If I am customizing this definition according to 7CPL, does it run for 7CPL or do I need to change something else?
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Antony Lewis



Joined: 23 Sep 2004
Posts: 1342
Affiliation: University of Sussex

PostPosted: February 05 2018  Reply with quote

You'd need to change the main cosmology equations as well (equations_ppf.f90).
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ruchika kaushik



Joined: 06 Dec 2017
Posts: 5
Affiliation: research scholar

PostPosted: February 05 2018  Reply with quote

Thank you very much for your reply.
As per as what I understood, changing this following part of equation_ppf.f90 will serve our purpose.

Code:
function w_de(a)
...
    if(.not. use_tabulated_w) then
       w_de=w_lam+wa_ppf*(1._dl-a)
...
end function w_de




Should I change any variables like quintessence or wxx?

So after changing the equations in both these files, Will it be running for 7CPL?
Or there any other changes in any other file are also required.
Thanks in advance.
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Antony Lewis



Joined: 23 Sep 2004
Posts: 1342
Affiliation: University of Sussex

PostPosted: February 06 2018  Reply with quote

I suggest you systematically search and check every place where dark energy parameters are used.
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