Probing primordial features with the primary CMB

Understand

CMB photons travel from the last scattering surface, when the primary CMB has been generated, along the surface of the light cone to us.

• During their travel, they are affected by many secondary effects such as the integrated Sachs-Wolfe effect and CMB lensing.
• These CMB secondary effects modify the CMB primary power spectrum adding degeneracies and decreasing the sensibility to primordial parameters.
• The possibility to reconstruct the primary CMB anisotropies will allow us to have a more direct observable to test the physics of the early universe.