标题： 异常全局弦和原初磁场 显示英文标题

标题： Anomalous Global Strings and Primordial Magnetic Fields

摘要： 我们提出了一种生成原初磁场的新机制，利用由与电磁学通过Wess-Zumino型相互作用耦合的异常全局弦所感应的磁场。 该机制可以在QCD中通过利用介子弦实现，介子弦是描述QCD禁闭尺度以下物理的线性σ模型中出现的全局涡旋。 在手征对称性破缺相变期间，可以产生介子弦，从而导致原初磁场。 我们计算了这些磁场的大小和相干长度。 它们似乎取决于弦的动力学。 在乐观的假设下，感应磁场的大小和相干尺度足以解释通过星系发电机机制产生观测到的星系磁场所需的大于$10^{-23}$高斯的种子磁场。 显示英文摘要

摘要： We propose a new mechanism for the generation of primordial magnetic fields, making use of the magnetic fields which are induced by anomalous global strings which couple to electromagnetism via Wess-Zumino type interactions. This mechanism can be realized in QCD by utilizing pion strings, global vortices which appear in the linear sigma model which describes physics below the QCD confinement scale. During the chiral symmetry breaking phase transition, pion strings can be produced, thus leading to primordial magnetic fields. We calculate the magnitude and coherence length of these fields. They are seen to depend on the string dynamics. With optimistic assumptions, both the magnitude and coherence scale of the induced magnetic fields can be large enough to explain the seed magnetic fields of greater than $10^{-23}$ Gauss necessary to produce the observed galactic magnetic fields via the galactic dynamo mechanism.