CosmoMC 2010 - alternative parametrization

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Ana Vasile
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Joined: March 26 2006
Affiliation: Institute for Space Sciences
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CosmoMC 2010 - alternative parametrization

Post by Ana Vasile » March 29 2010

Hi,

I've noticed (now that I need it) that the option to use H_0 and z_re parametrization (PARAMETRIZATION flag and params_H.f90 or params.f90) is not included anymore in this version.

Is this alternative parametrization not working with the newer CosmoMC versions or you just didn't update it because you didn't need it?

Ana

Antony Lewis
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Joined: September 23 2004
Affiliation: University of Sussex
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Re: CosmoMC 2010 - alternative parametrization

Post by Antony Lewis » March 29 2010

It would probably work with some modifications, eg. adding a SetParamNames function similar to that in the new params_CMB. But I think params_CMB is usually more efficient.

Ana Vasile
Posts: 25
Joined: March 26 2006
Affiliation: Institute for Space Sciences
Contact:

CosmoMC 2010 - alternative parametrization

Post by Ana Vasile » March 29 2010

Thank you for the answer Antony, I'll do this and see how it works.

Indeed params_CMB.f90 is more efficient; but now I am using some data and a model that for some reason lowers the H0 value almost out of the WMAP error bars unless I change its hard coded priors so I thought using H0 parametrization would be a good test to see what is happening.

Ana

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