Constraints on a Primordial Magnetic Field

Details Constraints on a Primordial Magnetic Field Constraints on a Primordial Magnetic Field

1997-01-13

arxiv.org/abs/astro-ph/9701063v1

Phys.Rev.Lett. 78 (1997) 3610-3613

Astronomy and Astrophysics

Astrophysics

4 pages, uses RevTex, submitted to PRL

Scientific paper

10.1103/PhysRevLett.78.3610

We derive an upper limit of $B_0<3.4\times 10^{-9}(\Omega_0h_{50}^2)^{1/2}$ Gauss on the present strength of any primordial homogeneous magnetic field. The microwave background anisotropy created by cosmological magnetic fields is calculated in the most general flat and open anisotropic cosmologies containing expansion-rate and 3-curvature anisotropies. Our limit is derived from a statistical analysis of the 4-year Cosmic Background Explorer data for anisotropy patterns characteristic of homogeneous anisotropy averaged over all possible sky orientations with respect to the COBE receiver. The limits we obtain are considerably stronger than those imposed by primordial nucleosynthesis and ensure that other magnetic field effects on the microwave background structure are unobservably small.

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