Microscopic derivation of PT-symmetric sine-Gordon theory from nonequilibrium spin-boson model via Keldysh methods supplies initial conditions for its renormalization group flow and reveals connections to integrable models near exceptional points.
Chatterjee, Communications on Pure and Applied Mathematics 67, 1737 (2014)
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Derivation of a $\PT$-Symmetric Sine-Gordon Model from a Nonequilibrium Spin-Boson System via Keldysh Functional Integrals
Microscopic derivation of PT-symmetric sine-Gordon theory from nonequilibrium spin-boson model via Keldysh methods supplies initial conditions for its renormalization group flow and reveals connections to integrable models near exceptional points.