03/07 2023 Seminar
- Title题目 A Fresh Look at the Calculation of Tunneling Actions
- Speaker报告人 Jose Ramon Espinosa (Madrid, IFT)
- Date日期 2023年03月07日 16:00
- Venue地点 Join Zoom Meeting https://us02web.zoom.us/j/88378049030?pwd=aVhsT24zcjU1R2ZNOC9jcktubXpRUT09 Meeting ID: 883 7804 9030 Passcode: 811418
The calculation of tunneling actions, that control the exponential suppression of the decay of metastable phases (like the unstable electroweak vacuum), can be reformulated as an elementary variational problem in field space. This alternative approach circumvents the use of bounces in Euclidean space by introducing an auxiliary function, a tunneling potential Vt that connects smoothly the metastable and stable phases of the field potential V. The tunneling action is obtained as the integral in field space of an action density that is a simple function of Vt and V and can be considered as a generalization of the thin-wall action to arbitrary potentials. This formalism provides new useful handles for the theoretical understanding of different features of vacuum decay, can be easily extended to include gravitational effects in an elegant way and has a number of interesting properties and applications that I will discuss.
报告人简介 Jose Ramon Espinosa is a full professor of IFT of Madrid in Spain and now is a visiting professor at CERN. He obtained his PhD in 1994 working on Particle Physics beyond the Standard Model at IEM (CSIC, Madrid) under the supervision of Mariano Quirós. After postdoctoral stays at DESY (Hamburg, Germany), University of Pennsylvania (Philadelphia, USA) and CERN (Geneva, Switzerland), from 1999 to 2008 he joined IMAFF (CSIC, Madrid) and then IFT-UAM/CSIC (Madrid) with a permanent position. From 2008 to 2018 he joined ICREA as Research Professor to work at IFAE. Since 2019 he become a member of IFT, Madrid. He is a world-leading particle physicist in BSM phenomenology and cosmology. He has published over 100 papers with over 17000 citations. Recently, he has discovered a new formalism for quantum tunneling in field theory.