11.30 a.m., Lecture Hall 4
Issue in Open Effective Field Theory
While the notion of open quantum systems is itself old, many of the existing studies deal with quantum mechanical systems rather than quantum field theories. In this talk, I will begin with a brief review of field theoretical/path integral tools currently available to deal with open quantum field theories. Then, I will go on to apply these tools to an open version of $\phi^4$ theory in four spacetime dimensions and its one loop renormalisability. I will also comment on the renormalisability of Lindblad structure. As opposed to usual unitary version of $\phi^4$, there are many interesting surprises.