## CosmoMC: use fixed CMB theory spectra from file

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
Posts: 33
Joined: July 17 2014
Affiliation: Johns Hopkins University

### CosmoMC: use fixed CMB theory spectra from file

Hi, is there a way to tell CosmoMC to use a fixed CMB theory spectrum from some text file in a regular action=0 run rather than calling CAMB?

Antony Lewis
Posts: 1634
Joined: September 23 2004
Affiliation: University of Sussex
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### Re: CosmoMC: use fixed CMB theory spectra from file

Not directly I think. This will be easier in Cobaya.

Posts: 33
Joined: July 17 2014
Affiliation: Johns Hopkins University

### Re: CosmoMC: use fixed CMB theory spectra from file

OK, thanks for the reply. I have a small difference in theory spectra from the same input parameters, I think from slightly different CAMB versions. But it shouldn't be a problem, I will figure out a test to show it doesn't matter for what I'm trying to do.