arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1602.02109hep-phastro-ph.COhep-th
收藏

大尺度磁场可以解释宇宙的重子不对称性

Large-scale magnetic fields can explain the baryon asymmetry of the Universe

Tomohiro Fujita, Kohei Kamada

摘要:

原始宇宙中的螺旋超磁场可以通过手征异常产生观测到的重子不对称性,而不需要粒子物理学标准模型之外的任何成分。虽然它们不产生$B-L$不对称性,但产生的重子不对称性在球化子洗出效应中幸存下来,因为产生过程保持活跃直到电弱相变。通过数值求解Boltzmann方程,找到了一个吸引子解,证明了如果耀变体观测所指示的大尺度磁场具有负螺旋度,并且存在于电弱相变之前的早期宇宙中,那么我们宇宙的重子不对称性是可以解释的。我们还导出了螺旋磁场强度的上界,它比宇宙微波背景约束更严格,以避免重子不对称性的过度产生。

英文摘要:

Helical hypermagnetic fields in the primordial Universe can produce the observed amount of baryon asymmetry through the chiral anomaly without any ingredients beyond the standard model of particle physics. While they generate no $B-L$ asymmetry, the generated baryon asymmetry survives the spharelon washout effect, because the generating process remains active until the electroweak phase transition. Solving the Boltzmann equation numerically and finding an attractor solution, we show that the baryon asymmetry of our Universe can be explained, if the present large-scale magnetic fields indicated by the blazar observations have a negative helicity and existed in the early Universe before the electroweak phase transition. We also derive the upper bound on the strength of the helical magnetic field, which is tighter than the cosmic microwave background constraint, to avoid the overproduction of baryon asymmetry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑