Limits on Cosmological Magnetic Fields and Other Anisotropic Stresses

Thumbnail Image

Date

Authors

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

Description

We discuss the cosmological evolution of matter sources with small anisotropic pressures. This includes electric and magnetic fields, collisionless relativistic particles, gravitons, antisymmetric axion fields in low-energy string cosmologies, spatial curvature anisotropies, and stresses arising from simple topological defects. The COBE microwave sky maps are used to place strong limits on the possible contribution of these sources to the total density of the universe. We explain why the limits obtained from primordial nucleosynthesis are generally weaker than those imposed by the microwave background isotropy. The effect of inflation on all these stresses is also calculated.
28 pages, Tex file, no figures. Proceedings 4th Paris Cosmology Colloquium, Paris June 1997, ed H. de Vega, and N. Sanchez

Keywords

General Relativity and Quantum Cosmology, Astrophysics

Citation

URI

http://salesiana.dossiersoluciones.com/handle/123456789/36090

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/gr-qc/9712020
 http://arxiv.org/abs/gr-qc/9712020

Collections

arXiv