Testing parity-violating physics from cosmic rotation power reconstruction

Understand

We study the reconstruction of the cosmic rotation power spectrum produced by parity-violating physics, with an eye to ongoing and near future cosmic microwave background (CMB) experiments such as BICEP Array, CMBS4, LiteBIRD and Simons Observatory.

• In addition to the inflationary gravitational waves and gravitational lensing, measurements of other various effects on CMB polarization open new window into the early Universe.
• One of these is anisotropies of the cosmic polarization rotation which probes the Chern-Simons term generally predicted by string theory.
• The anisotropies of the cosmic rotation are also generated by the primordial magnetism and in the Standard Model extention framework.