PRISM: Recovery of the primordial spectrum from Planck data

Understand

The primordial power spectrum describes the initial perturbations that seeded the large-scale structure we observe today.

• It provides an indirect probe of inflation or other structure-formation mechanisms.
• In this letter, we recover the primordial power spectrum from the Planck PR1 dataset, using our recently published algorithm PRISM.
• PRISM is a sparsity-based inversion method, that aims at recovering features in the primordial power spectrum from the empirical power spectrum of the cosmic microwave background (CMB).