CMB anisotropies generated by a stochastic background of primordial magnetic fields with non-zero helicity

Abstract

We consider the impact of a stochastic background of primordial magnetic fields with non-vanishing helicity on CMB anisotropies in temperature and polarization. We compute the exact expressions for the scalar, vector and tensor part of the energy-momentum tensor including the helical contribution, by assuming a power-law dependence for the spectra and a comoving cutoff which mimics the damping due to viscosity. We also compute the parity-odd correlator between the helical and non-helical contribution which generate the TB and EB cross-correlation in the CMB pattern. We finally show the impact of including the helical term on the power spectra of CMB anisotropies up to multipoles with ell ~ O(10^3)$.

25 pages, 30 figures

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• Consistency of Planck, ACT and SPT constraints on magnetically assisted recombination and forecasts for future experiments
• POLOCALC: a Novel Method to Measure the Absolute Polarization Orientation of the Cosmic Microwave Background
• Inflationary magnetogenesis with added helicity: constraints from non-gaussianities
• Constraints on primordial magnetic fields from magnetically-induced perturbations: current status and future perspectives with LiteBIRD and future ground based experiments
• Improved CMB anisotropy constraints on primordial magnetic fields from the post-recombination ionization history
• Scale-invariant helical magnetic field evolution and the duration of inflation
• Simulations and observational tests of primordial magnetic fields from Cosmic Microwave Background constraints
• Searching for Primordial Magnetic Fields with CMB B-modes
• Statistical Properties of Scale-Invariant Helical Magnetic Fields and Applications to Cosmology
• Primordial magnetic helicity evolution with a homogeneous magnetic field from inflation
• Magnetic heating across the cosmological recombination era: Results from 3D MHD simulations
• Enhancing the cross-correlations between magnetic fields and scalar perturbations through parity violation
• Reduced bispectrum seeded by helical primordial magnetic fields
• Circumventing the challenges in the choice of the non-conformal coupling function in inflationary magnetogenesis
• Imprints of the post recombination dissipation of helical magnetic field on the Cosmic Microwave Background Radiation
• Global Signals of the First Molecules from the Dark Ages in the Presence of Primordial Magnetic Fields