2019

CMB circular and B-mode polarization from new interactions

Bartolo, Nicola, Hoseinpour, Ahmad, Matarrese, Sabino et al.

Understand

Standard models describing the radiation transfer of the cosmic microwave background (CMB) through Compton scattering predict that cosmological scalar perturbations at linear order are not able to source V and B polarization modes.

  • In this work, we investigate the possibility that such CMB polarization modes are generated even in the presence of linear scalar perturbations only.
  • We provide a general parametrization of the photon-fermion forward-scattering amplitude and compute mixing terms between different CMB polarization modes.
  • We discuss different general extensions of Standard Model interactions which violate discrete symmetries, while preserving the combination of charge conjugation, parity and time reversal.

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