Dust moments: towards a new modelling of the galactic dust emission for CMB B-modes analysis

Understand

The characterization of the spectral energy distribution (SED) of dust emission has become a critical issue in the quest for primordial B-modes.

• The dust SED is often approximated by a modified black body (MBB) emission law but the extent to which this is accurate is unclear.
• This paper addresses this question, expanding the dust SED at the power spectrum level.
• The expansion is performed by means of moments around the MBB law, related to derivatives with respect to the dust spectral index.