Hello,
I would like reproduce the figure 2 of the arXiv:astroph/0309240 (Largescale surveys and cosmic structure J.A. Peacock 2003). This is the about the Transfer function of matter dominated cosmologies. I would like to see the behaviour of the different components (baryons, CDM, HDM, MDM?).
Can I do this with CAMB? When attempted, I was having errors saying:
"Your matter densities are strange (may not have been set)
Invalid parameter value
ERROR STOP Invalid parameter"
Although the plot doesn't indicate the redshift, I would like to see it at z = 250.
Can anyone give me a hint?
Regards,
Nick
CAMB: matterdominated cosmologies

 Posts: 2
 Joined: November 11 2022
 Affiliation: Astronomical Institute of Charles University
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 Posts: 1961
 Joined: September 23 2004
 Affiliation: University of Sussex
 Contact:
Re: CAMB: matterdominated cosmologies
You can use standard parameters and plot the transfer functions for different variables. e.g. see box 48
https://camb.readthedocs.io/en/latest/CAMBdemo.html
and
https://camb.readthedocs.io/en/latest/transfer_variables.html
https://camb.readthedocs.io/en/latest/CAMBdemo.html
and
https://camb.readthedocs.io/en/latest/transfer_variables.html

 Posts: 2
 Joined: November 11 2022
 Affiliation: Astronomical Institute of Charles University
 Contact:
Re: CAMB: matterdominated cosmologies
Hello,
sorry but I don't really understand what you say. I am actually plotting the TF for different variables but my question is how can I simulate a universe with Omega_m = 1 (Omega_bar = 1 or Omega_CDM =0 or Omega_nu = 1), Omega_DE = 0, Omega_k = 0 .
Isn't it Σ_i Ω_i =1 ?
When tried:
Om_b h^2 = 0.023157
Om_c h^2 = 0.000000
Om_nu h^2 = 4.000000
I am having:
Om_darkenergy = *********
Om_K = 0.000000
Om_m (inc Om_u) = 16.092628
100 theta (CosmoMC) = 1.222761
N_eff (total) = 4.044000
at z =******* sigma8 (all matter) = 0.0004
at z =******* sigma8^2_vd/sigma8 = 0.0004
Does it make sense?
Thanks in advance,
Nick
sorry but I don't really understand what you say. I am actually plotting the TF for different variables but my question is how can I simulate a universe with Omega_m = 1 (Omega_bar = 1 or Omega_CDM =0 or Omega_nu = 1), Omega_DE = 0, Omega_k = 0 .
Isn't it Σ_i Ω_i =1 ?
When tried:
Om_b h^2 = 0.023157
Om_c h^2 = 0.000000
Om_nu h^2 = 4.000000
I am having:
Om_darkenergy = *********
Om_K = 0.000000
Om_m (inc Om_u) = 16.092628
100 theta (CosmoMC) = 1.222761
N_eff (total) = 4.044000
at z =******* sigma8 (all matter) = 0.0004
at z =******* sigma8^2_vd/sigma8 = 0.0004
Does it make sense?
Thanks in advance,
Nick

 Posts: 1961
 Joined: September 23 2004
 Affiliation: University of Sussex
 Contact:
Re: CAMB: matterdominated cosmologies
Looks like a weird cosmology, you don't have very low H0, so Omega_de is negative? I don't know exactly how far away from sensible models CAMB will work, it's certainly not much tested for them.