Looking for Cosmological Alfven Waves inWilkinson Microwave Anisotropy ProbeData
- 20 August 2004
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 611 (2) , 655-659
- https://doi.org/10.1086/422213
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 al-1,m and al+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.Keywords
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