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brinckmann / montepython_public

Public repository for the Monte Python Code
MIT License
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How to include foreground model in a fake CMB likelihood? #307

Closed Jimmy022 closed 9 months ago

Jimmy022 commented 1 year ago

Hi all,

I would like to ask, if I want to add foreground parameters (such as "BB_dust") for the parameter constraints with a fake CMB likelihood, how should I set it? Thanks for any help！

Best wishes Jimmy

brinckmann commented 1 year ago

Hi Jimmy,

Sorry for the slow reply. This is not a feature in the mock CMB likelihoods in MontePython and would have to be implemented, which might be a bit tricky as you probably would need to implement a dust template tied to the nuisance parameter. What people usually do when they want to include the effect of foregrounds is the include estimate of the effective foreground noise on the CMB spectra relevant to the experiment that they add to the detector white noise estimate. E.g. Simons Observatory did something along these lines for their forecast likelihood, if I remember correctly.

Best, Thejs