TQM unit is pleased to invete you to our seminar.

Seminar by Prof. Walter Farina (School of Exacts and Natural Sciences of the University of Buenos Aires)

"Body perception under the free energy formulation for robots and humans" by Dr. Pablo Lanillos, Technical University of Munich

Speaker: Samir K Mondal, Principal Scientist, CSIR-Central Scientific Instruments Organisation, Chandigarh, India

Georg Michelitsch, Technische Universität München, Germany

Anika Haller (Helmholtz-Zentrum Berlin, Germany)

Mr. Katawoura Beltako, Nanodevice Quantum Simulation (NQS Group)
Aix-Marseille University, France

"Many-body quantum spectroscopies in extremes" by Prof. Mack Kira, University of Michigan

Hosted by TQM unit.

Speaker: Dr. Yutaro Shoji from Nagoya University

Abstract:
The electroweak vacuum is not absolutely stable in the standard model and various models beyond the standard model. This is due to an appearance of another deeper vacuum, into which the electroweak vacuum can decay. The decay proceeds through quantum tunneling and the rate is expressed with an exponential suppression factor and a pre-factor. The suppression factor has been calculated in many papers, but a naive dimensional analysis has been usually adopted for the pre-factor.

We have pointed out that such an evaluation can suffer from large quantum corrections and it is important to calculate the pre-factor as well.

To calculate the pre-factor, we had problems in a gauge sector; its gauge invariance is not explicitly shown, and there appear zero modes, which we could not deal with.

We have solved these problems and made it possible to determine vacuum decay rates precisely.

As applications, we analyzed the decay rates in the standard model and its fermionic extensions. We also provide a public code, which can be used for models that exhibit classical scale invariance at a high energy scale.