CMB limits on large-scale magnetic fields in an inhomogeneous universe
C. A. Clarkson, A. A. Coley, R. Maartens, C. G. Tsagas
Abstract
We use the cosmic microwave background temperature anisotropy to place limits on large-scale magnetic fields in an inhomogeneous (perturbed Friedmann) universe. If no assumptions are made about the spacetime geometry, only a weak limit can be deduced directly from the CMB. In the special case where spatial inhomogeneity is neglected to first order, the upper limit is much stronger, i.e. a few nano-G
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