IJS-FMF high-energy physics seminars

Yutaro Shoji: Precise Calculation of the Decay Rate of False Vacuum with Multi-Field Bounce

https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (Zoom)




The stability of a vacuum has attracted interests of particle physicists and cosmologists for a long time. The appearance of another deeper vacuum in the standard model and beyond makes the electroweak vacuum metastable, which finally decays through tunneling. If it is the case, we need to ensure that the lifetime is much longer than the age of the universe and the estimation of the lifetime is of great importance. The precise determination of the lifetime involving the quantum corrections from gauge bosons is technically difficult and it is not until recently that a complete one-loop calculation became possible. We extend our previous result, which is applicable only to the case where only one scalar field is responsible for the decay, to the multi-field case. It has great applicability such as to the color or charge breaking vacuums in the supersymmetric models.