标题： 宇宙磁场和其他各向异性应力的限制 显示英文标题

标题： Limits on Cosmological Magnetic Fields and Other Anisotropic Stresses

摘要： 我们讨论具有小各向异性压力的物质源的宇宙学演化。 这包括电场和磁场、无碰撞相对论粒子、引力子、低能弦宇宙学中的反对称轴子场、空间曲率各向异性以及来自简单拓扑缺陷的应力。 COBE微波天空图用于对这些源对宇宙总密度的可能贡献施加强烈限制。 我们解释了为什么通过原初核合成得到的限制通常比微波背景各向同性所施加的限制要弱。 所有这些应力在膨胀期间的影响也进行了计算。 显示英文摘要

摘要： 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.