CMB limits on large-scale magnetic fields in an inhomogeneous universe

Details CMB limits on large-scale magnetic fields in an inhomogeneous universe CMB limits on large-scale magnetic fields in an inhomogeneous universe

2002-08-20

arxiv.org/abs/astro-ph/0208364v2

Class.Quant.Grav. 20 (2003) 1519-1528

Astronomy and Astrophysics

Astrophysics

9 pages, 1 figure; uses iopart.cls; v2 has minor changes to match version to be published in in Class. Quantum Grav

Scientific paper

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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