Inflationary Magnetogenesis with Broken Local U(1) Symmetry

 

Dr Chunshan Lin
Kyoto University
 

1 March 2016 (Tuesday)
2:30 pm
IAS2042, 2/F, Lo Ka Chung Building, Lee Shau Kee Campus, HKUST

Abstract:

In this talk, the speaker will point out that a successful inflationary magnetogenesis could be realized if the local U(1) gauge symmetry is broken during inflation. The effective electric charge is fixed as a fundamental constant, which allows the speaker to obtain an almost scale invariant magnetic spectrum avoiding both the strong coupling and back reaction problems. He will then examine the corrections to the primordial curvature perturbation due to these stochastic electromagnetic fields and find that, at both linear and non-linear orders, the contributions from the electromagnetic field are negligible compared to those created from vacuum fluctuations. Finally, the U(1) gauge symmetry is restored at the end of inflation.