Polychronic Tunneling: New Tunneling Processes Experiencing Euclidean and Lorentzian Evolution Simultaneously

Abstract

We discuss new possible tunneling processes in the presence of gravity. We formulate quantum tunneling using the Wheeler-deWitt canonical quantization and the WKB approximation. The distinctive feature of our formulation is that it accommodates the coexistence of Euclidean and Lorentzian evolution. It opens up a new possibility of quantum tunneling; e.g. a bubble wall itself tunnels the potential barrier pulling the field nearby, where the wall region experiences the Euclidean evolution while the other regions experience the Lorentzian evolution simultaneously. We execute numerical analysis and find that such a process can have a much higher tunneling rate than that of the Coleman-De Luccia bounce. We also find that the new tunneling processes exist even in the decoupling regime of gravity and affect low energy phenomenology.

About the Speaker

Dr. Masahide YAMAGUCHI completed his PhD at the University of Tokyo in 1999. Then he did postdoctoral research at RESCEU in his alma mater and at Brown University in USA. Dr. Yamaguchi became a faculty member at Aoyama Gakuin University in 2004 and moved to Tokyo Institute of Technology in 2010. Recently, he moved to the Institute for Basic Science in Korea as a director.

About the Program

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