Copi Craig J, Ferrer Francesc, Vachaspati Tanmay, Achúcarro Ana
CERCA, Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106-7079, USA.
Phys Rev Lett. 2008 Oct 24;101(17):171302. doi: 10.1103/PhysRevLett.101.171302.
Many models of baryogenesis rely on anomalous particle physics processes to give baryon number violation. By numerically evolving the electroweak equations on a lattice, we show that baryogenesis in these models creates helical cosmic magnetic fields, though the helicity created is smaller than earlier analytical estimates. After a transitory period, electroweak dynamics is found to conserve the Chern-Simons number and the total electromagnetic helicity. We argue that baryogenesis could lead to magnetic fields of nano-Gauss strength today on astrophysical length scales. In addition to being astrophysically relevant, such helical magnetic fields can provide an independent probe of baryogenesis and CP violation in particle physics.
许多重子生成模型依赖反常的粒子物理过程来实现重子数违反。通过在格点上对弱电方程进行数值演化，我们表明这些模型中的重子生成会产生螺旋形的宇宙磁场，尽管所产生的螺旋度比早期的解析估计要小。经过一个过渡阶段后，发现弱电动力学守恒陈 - 西蒙斯数和总电磁螺旋度。我们认为重子生成可能导致如今在天体物理长度尺度上出现纳高斯强度的磁场。除了与天体物理学相关外，这种螺旋形磁场还可以为粒子物理学中的重子生成和CP破坏提供一个独立的探测手段。
