Looking for Cosmological Alfven Waves inWilkinson Microwave Anisotropy ProbeData

2004/03/31 by Gang Chen, Pia Mukherjee, Tina Kahniashvili +2 · 1 citation
Physics and Astronomy · #Anisotropy #CMB cold spot #Cosmic microwave background #Cosmology and Gravitation Theories #Electrical and Electromagnetic Research #Field (mathematics) #Galaxies: Formation, Evolution, Phenomena #Magnetic field #Multipole expansion #Spectral index #Vorticity #astro-ph

paper · pdf · doi:10.1086/422213

published as Astrophys.J.611:655-659,2004 · 14 pages, 3 figures, minor changes, references added, ApJ, in press

arxiv created 2004/04/27 · openalex publication_date 2004/08/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

A primordial cosmological magnetic field induces and supports vorticity or Alfvén waves, which in turn generate cosmic microwave background (CMB) anisotropies. A homogeneous primordial magnetic field with fixed direction induces correlations between the a l -1, m and a l +1, m multipole coefficients of the CMB temperature anisotropy field. We discuss the constraints that can be placed on the strength of such a primordial magnetic field using CMB anisotropy data from the Wilkinson Microwave Anisotropy Probe experiment. We place 3 σ upper limits on the strength of the magnetic field of B < 15 nG for vector perturbation spectral index n = -5 and B < 1.7 nG for n = -7.

Citations

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• Faraday rotation of the cosmic microwave background polarization by a stochastic magnetic field