CMB monopole temperature of cosmomc

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
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Jaiseung Kim
Posts: 13
Joined: January 21 2008
Affiliation: Max Planck Institute for Astrophysics

CMB monopole temperature of cosmomc

Post by Jaiseung Kim » December 17 2008

It seems that the CMB monopole temperature is hard-coded as follows:
camb.f90:
P%TCMB = 2.726

I think that the most up-to-date number is 2.725 K.
I am concerned that it may affect the value of log[10^{10} A_s] slightly.

Savvas Nesseris
Posts: 70
Joined: April 05 2005
Affiliation: UAM/IFT
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CMB monopole temperature of cosmomc

Post by Savvas Nesseris » December 17 2008

Isn't it also on the parameter file (params.ini) ?
temp_cmb = 2.726
If I'm not wrong, CAMB will use the value from the parameter file...

Jaiseung Kim
Posts: 13
Joined: January 21 2008
Affiliation: Max Planck Institute for Astrophysics

CMB monopole temperature of cosmomc

Post by Jaiseung Kim » December 17 2008

I believe that the parameter file you are talking about is a camb parameter file and the parameter file for cosmomc does not have 'temp_cmb = 2.726'.

I also tried to vary the 'temp_cmb = 2.726' in the camb parameter file and it seems the change in the camb parameter file does not affect the amplitude of the camb Cls, but other internally derived cosmological parameters.

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