Inflationary Magnetogenesis with On-shell Local U(1) Symmetry

6th IF-YITP GR+HEP+Cosmo International Symposium

Domènech, Guillem^1 ; Lin, Chunshan^1 ; Sasaki, Misao^1

Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Japan^1

关键词: Back reaction;    Cosmic magnetic fields;    New mechanisms;    Strong coupling;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/883/1/012013/pdf
DOI  :  10.1088/1742-6596/883/1/012013

来源: IOP

【 摘 要 】

We propose a new mechanism for inflationary magnetogenesis in which the local U(1) symmetry is broken during inflation. Nevertheless it is shown that the U(1) symmetry is recovered on-shell. We find that it is free from both the strong coupling and back reaction problems, and can explain the origin of cosmic magnetic fields on intergalactic scales, whose existence has been strongly suggested by recent observations.