| Nonunitary quantum mechanics has been used in the past to study irreversibility, dissipation, and decay in a variety of physical systems. In this work, we employ a general scheme to deal with systems governed by non-Hermitian Hamiltonians. We argue that the Schwinger-Keldysh formalism gives a natural description for those problems. To elucidate the method, we study a simple model inspired by mesoscopic physicsan asymmetric junction. The system is governed by a Non-Hermitian Hamiltonian, which captures essential aspects of irreversibility. |
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