[COSMOMC] : sigma_8

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
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Pierre Delsart
Posts: 14
Joined: October 28 2008
Affiliation: tt

[COSMOMC] : sigma_8

Post by Pierre Delsart » July 23 2009

Hello,
I just try to test my module in cosmomc without CMB, mpk and SN, just my module. I need sigma_8 free, thus I put : get_sigma8 = T in params.ini.
I launch a chain with 10 000 samples but the values of sigma8 are not that I expected.
I know that the value of -ln(L) is responsible of the move of the differents parameters. But in my case, I get the impression that the move of sigma8 don't depend on my value of -ln(L).
Could you explain me how operate sigma8 please?
Thanks a lot

Antony Lewis
Posts: 1498
Joined: September 23 2004
Affiliation: University of Sussex
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Re: [COSMOMC] : sigma_8

Post by Antony Lewis » September 08 2009

sigma_8 is a derived parameter, but if get_sigma8 = T it should be written out correctly in the chain files.

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