Microwave Background Anisotropies from Alfven waves

Abstract

We investigate microwave background anisotropies in the presence of primordial magnetic fields. We show that a homogeneous field with fixed direction can amplify vector perturbations. We calculate the correlations of $\delta T/T$ explicitly and show that a large scale coherent field induces correlations between $a_{\ell -1,m}$ and $a_{\ell +1,m}$. We discuss constraints on amplitude and spectrum of a primordial magnetic field imposed by observations of CMB anisotropies.

18 page LaTeX file, 4 postscript figs. included, submitted to PRD

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