In the BeyondPlanck project, we propose an end-to-end solution to the CMB analysis problem that allows for joint estimation of cosmological parameters, astrophysical components, and instrument specifications. The engine of this method is called Gibbs sampling, which has already been applied successfully to CMB component separation. The new and critical step is to apply this method to raw time-ordered observations observed directly by the instrument, as opposed to pre-processed frequency maps, thereby closing the loop between instrumental characterization, astrophysical component separation and cosmological interpretation. While representing a ~100-fold increase in input data volume, this step is unavoidable in order to break through the current foreground-induced systematics floor.
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