旋转宇宙弦环的磁成因
Magnetogenesis from Rotating Cosmic String Loops
摘要：
我们提出了一种机制，通过旋转宇宙弦环背后的引力拖曳，在等离子体中产生涡旋。涡旋运动通过哈里森-里斯机制产生磁场;通过星系坍缩和发电机放大，磁场进一步增强。采用速度依赖的单尺度模型（VOS）的弦网络，并纳入循环动力学，我们计算周围的时间去耦产生的磁场：这些只是强大的和连贯的足以占目前观察到的磁场在螺旋星系，如果有效的发电机与$Γ_{dy}^{-1}\approx 0.3$陀螺仪存在。
英文摘要：
We present a mechanism to create vortices in a plasma via gravitational dragging behind rotating cosmic string loops. The vortical motions create magnetic fields by means of the Harrison-Rees mechanism; the fields are further enhanced through galactic collapse and dynamo amplification. Employing the Velocity dependent One Scale model (VOS) for the string network and incorporating loop dynamics, we compute the magnetic fields generated around the time of decoupling: these are just strong and coherent enough to account for presently observed magnetic fields in spiral galaxies if efficient dynamos with $Γ_{dy}^{-1}\approx 0.3$ Gyr are present.
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