Constraints on a Primordial Magnetic Field
ArXiv astro-ph/9701063 (1997)
Abstract:
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.Closet non-Gaussianity of anisotropic Gaussian fluctuations
PHYSICAL REVIEW D 56:8 (1997) 4578-4591
Constraints on a primordial magnetic field
PHYSICAL REVIEW LETTERS 78:19 (1997) 3610-3613
Cumulants as non-Gaussian qualifiers
PHYSICAL REVIEW D 56:8 (1997) 4592-4603
Non-Gaussian spectra in cosmic microwave background temperature anisotropies
PHYSICAL REVIEW D 55:6 (1997) 3358-3372