Looking for Cosmological Alfven Waves in WMAP Data

Details Looking for Cosmological Alfven Waves in WMAP Data Looking for Cosmological Alfven Waves in WMAP Data

2004-03-30

arxiv.org/abs/astro-ph/0403695v2

Astrophys.J.611:655-659,2004

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, minor changes, references added, ApJ, in press

Scientific paper

10.1086/422213

A primordial cosmological magnetic field induces and supports vorticity or Alfven 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 WMAP experiment. We place 3 $\sigma$ 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 $n=-7$.

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