Compute H_0, D_M, D_H, etc, at desired effective redshift

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Jose Lozano
Posts: 19
Joined: June 27 2023
Affiliation: Universidad Nacional Autónoma de México

Compute H_0, D_M, D_H, etc, at desired effective redshift

Post by Jose Lozano »

Hello everyone,

Using the latest cosmological dataset, I'm using CosmoMC to run chains for certain models. I want to obtain the values of H_0, D_M, D_H, etc, at other effective redshift z_eff that I want. The default values that I obtained at certain redshirt are given below

param bestfit lower1 upper1 lower2 upper2
66 0.7252572E+02 0.7084691E+02 0.7406545E+02 0.7074918E+02 0.7430673E+02 H(0.15)
67 0.6449964E+03 0.6298819E+03 0.6623387E+03 0.6276073E+03 0.6634118E+03 D_{\rm{M}}(0.15)
68 0.8277988E+02 0.8155620E+02 0.8390730E+02 0.8149619E+02 0.8408351E+02 H(0.38)
69 0.1536518E+04 0.1506203E+04 0.1571074E+04 0.1501538E+04 0.1573107E+04 D_{\rm{M}}(0.38)
76 0.4608074E+00 0.4405504E+00 0.4870146E+00 0.4367573E+00 0.4870146E+00 f\sigma_8(0.15)
77 0.7469791E+00 0.7314743E+00 0.7686590E+00 0.7308546E+00 0.7732840E+00 \sigma_8(0.15)
78 0.4774870E+00 0.4617477E+00 0.4975820E+00 0.4582292E+00 0.4978201E+00 f\sigma_8(0.38)
79 0.6613576E+00 0.6480308E+00 0.6823024E+00 0.6476728E+00 0.6855098E+00 \sigma_8(0.38)


In which part of the code I should modify to obtain H(0.31), H(0.51), etc?

Thanks
Jose
Antony Lewis
Posts: 1963
Joined: September 23 2004
Affiliation: University of Sussex
Contact:

Re: Compute H_0, D_M, D_H, etc, at desired effective redshift

Post by Antony Lewis »

Look in CosmologyTypes.
However you might want to consider using Cobaya.
Jose Lozano
Posts: 19
Joined: June 27 2023
Affiliation: Universidad Nacional Autónoma de México

Re: Compute H_0, D_M, D_H, etc, at desired effective redshift

Post by Jose Lozano »

Hello Anthony,

Thanks! I'm using CosmoMC because some dark energy models from a particle physics perspective were implemented in CAMB version Nov16 and COBAYA doesn't allow me to use an old version of CAMB. But I already obtained the desired values for different redshifts.

On the other hand, I want to obtain the parameters rs/DV or F_{AP} at different redshifts as I did for fsigma8(z), Hubble(z). To introduce these parameters, do I need just to include them derived_theory.paramnames?

Best regards,

Jose Lozano
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