Status  Confirmed 
Seminar Series  SEMEXCEP 
Subjects  hepth 
Date  Friday 29 September 2023 
Time  14:30 
Institute  CPHT 
Seminar Room  Salle de conférences du LLR aile 5 (Ecole Polytechnique) 
Speaker's Last Name  Mukhanov 
Speaker's First Name  Slava 
Speaker's Email Address  
Speaker's Institution  LudwigMaximiliansUniversitat Munchen 
Title  False vacuum decay: thick wall approximation 
Abstract  I will consider the case where the potential for the scalar field is either unbounded from below or the second minimum corresponding to the true va cuum has a depth exceeding the height of the potential barrier. In this case, the materialized bubbles dominating the vacuum decay naturally have a thick wall and the thinwall approximation is not applicable. In such a case the main contribution to the action determining the decay probability of the false va cuum comes from the part of the solution for which the potential term in the equation for instantons can be neglected compared to the friction term. I show that the developed approximation exactly reproduces the leading order results for the few known exactly solvable potentials. 
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