Signatures of primordial helicity in the CMBR

Abstract

We have studied ways in which helical primordial magnetic fields could be constrained by measurements of the cosmic microwave background radiation (CMBR). If there were helical flows in the primordial plasma at the time of recombination, they would produce parity violating temperature-polarization correlations ($C_l^{TB}$ and $C_l^{EB}$). However, the magnitude of helical flows induced by helical magnetic fields is unobservably small. We discuss an alternate scheme for extracting the helicity of a stochastically homogeneous and isotropic primordial magnetic field using Faraday rotation measure maps of the CMBR and the power spectrum of B-type polarization ($C_l^{BB}$).

3 pages. To be published in the proceedings of the 31st ICHEP, Amsterdam, July 24-31, 2002. Based on the talk given by L. Pogosian

References in corpus (2)

• Estimate of the primordial magnetic field helicity
• Signatures of kinetic and magnetic helicity in the CMBR

Cited by in corpus (7)

• CMB anisotropies from primordial inhomogeneous magnetic fields
• Birefringent Gravitational Waves and the Consistency Check of Inflation
• Is the Universe odd?
• Faraday Rotation of the Cosmic Microwave Background Polarization and Primordial Magnetic Field Properties
• Constraints on primordial magnetic fields from magnetically-induced perturbations: current status and future perspectives with LiteBIRD and future ground based experiments
• Simulations and observational tests of primordial magnetic fields from Cosmic Microwave Background constraints
• Generation of gravitational waves in dynamical Chern-Simons gravity