1307.1235 (Y. Kuwahara et al.)

From Classical Mechanics with Doubled Degrees of Freedom to Quantum
Field Theory for Nonconservative System    [PDF]

Y. Kuwahara, Y. Nakamura, Y. Yamanaka

The $2 \times 2$-matrix structure of Green's functions is a common feature for the real-time formalisms of quantum field theory under thermal situations, such as the closed time path formalism and Thermo Field Dynamics (TFD). It has been believed to originate from quantum nature. Recently, Galley has proposed the Hamilton's principle with initial data for nonconservative classical systems, doubling each degree of freedom [Phys. Rev. Lett. 110, 174301 (2013)]. We show that the Galley's Hamilton formalism can be extended to quantum field and that the resulting theory is naturally identical with nonequilibrium TFD.

View original: http://arxiv.org/abs/1307.1235