Secondary CMB anisotropies from bulk motions in the presence of stochastic magnetic fields

Abstract

Bulk motions of electrons along the line of sight induce secondary temperature fluctuations in the post-decoupling, reionized universe. In the presence of a magnetic field not only the scalar mode but also the vector mode act as a source for the bulk motion. The resulting angular power spectrum of temperature anisotropies of the cosmic microwave background is calculated assuming a simple model of reionization.Contributions from the standard adiabatic, curvature mode and a non helical magnetic field are included. The contribution due to magnetic fields with field strengths of order nG and negative magnetic spectral indices becomes important for multipoles larger than $\ell \sim 10^4$.

14 pages, 3 figures; matches version published in PRD

References in corpus (4)

• High resolution CMB power spectrum from the complete ACBAR data set
• Secondary anisotropies of the CMB
• Effects of a Primordial Magnetic Field on Low and High Multipoles of the CMB
• Constraining primordial magnetic fields with distortions of the black-body spectrum of the cosmic microwave background: pre- and post-decoupling contributions

Cited by in corpus (6)

• Generation of large-scale magnetic fields, non-Gaussianity, and primordial gravitational waves in inflationary cosmology
• 21 cm line signal from magnetic modes
• Power spectrum of post-inflationary primordial magnetic fields
• CMB anisotropies and linear matter power spectrum in models with non-thermal neutrinos and primordial magnetic fields
• Magnetic field back reaction on the matter power spectrum
• Cross correlations of the CMB Doppler mode and the 21 cm brightness temperature in the presence of a primordial magnetic field