Cosmological parameter forecasts by a joint 2D tomographic approach to CMB and galaxy clustering

Understand

The cross-correlation between the cosmic microwave background (CMB) fields and matter tracers carries important cosmological information.

• In this paper, we forecast by a signal-to-noise ratio analysis the information contained in the cross-correlation of the CMB anisotropy fields with source counts for future cosmological observations and its impact on cosmological parameters uncertainties, using a joint tomographic analysis.
• We include temperature, polarization and lensing for the CMB fields and galaxy number counts for the matter tracers.
• By restricting ourselves to quasi-linear scales, we forecast by a Fisher matrix formalism the relative importance of the cross-correlation of source counts with the CMB in the constraints on the parameters for several cosmological models.