Reports on Progress in Physics ( IF 18.1 ) Pub Date : 2021-06-14 , DOI: 10.1088/1361-6633/ac03a9 Tanmay Vachaspati
A variety of observations impose upper limits at the nano Gauss level on magnetic fields that are coherent on inter-galactic scales while blazar observations indicate a lower bound ∼10−16 G. Such magnetic fields can play an important astrophysical role, for example at cosmic recombination and during structure formation, and also provide crucial information for particle physics in the early Universe. Magnetic fields with significant energy density could have been produced at the electroweak phase transition. The evolution and survival of magnetic fields produced on sub-horizon scales in the early Universe, however, depends on the magnetic helicity which is related to violation of symmetries in fundamental particle interactions. The generation of magnetic helicity requires new CP violating interactions that can be tested by accelerator experiments via decay channels of the Higgs particle.
中文翻译:
宇宙磁场研究进展
各种观测对在星系际尺度上相干的磁场施加了纳米高斯水平的上限,而耀变体观测表明下限约为 10 -16G. 这种磁场可以发挥重要的天体物理学作用,例如在宇宙重组和结构形成过程中,也为早期宇宙的粒子物理学提供重要信息。具有显着能量密度的磁场可以在电弱相变处产生。然而,早期宇宙中亚地平线尺度产生的磁场的演化和生存取决于与基本粒子相互作用中的对称性破坏有关的磁螺旋度。磁螺旋的产生需要新的 CP 违反相互作用,可以通过加速器实验通过希格斯粒子的衰变通道进行测试。