CosmoMC: Why this error when using w as a parameter?

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Jie Ren
Posts: 28
Joined: May 13 2006
Affiliation: Theoretical Physics Division, Chern Institute of Mathematics, Nankai University, Tianjin, China

CosmoMC: Why this error when using w as a parameter?

Post by Jie Ren » September 02 2006

After I compiled CosmoMC, it could retrun the best-fit values of the 6-parameter model. However, when I modified the file "params.ini" to use "w" as a parameter, an error occurred. The only change to the original file is

*******************************************
action = 2

#parameter start center, min, max, start width, st. dev. estimate

#w
param7 = -1 -1.5 -0.5 0.01 0.01
*******************************************

This error occurred when running "./cosmomc params.ini":

...
ERROR: Trial parameters hit prior or error in function evaluation
Try starting further away from problem regions?

I changed the "param7" as

param7 = -1 -1.1 -0.9 0.01 0.01
or
param7 = -1 -1.5 -0.5 0.1 0.1

then this error also occurred. If I changed the parameter "omk" instead of "w" as

#omk
param5 = 0 -0.1 0.1 0.01 0.01

this error would also occur.

Why this error? How to use "w" as a parameter? Thank you very much!

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