Phys. Rev. D 57, 6398–6405 (1998)Choice of initial states in nonequilibrium dynamicsReceived 21 November 1997; published in the issue dated 15 May 1998 Imposing initial conditions to nonequilibrium systems at some time t0 leads, in renormalized quantum field theory, to the appearance of singularities in the variable t-t0 in relevant physical quantities, such as energy density and pressure. These “initial singularities” can be traced back to the choice of initial state. We construct here, by a Bogoliubov transformation, initial states such that these singularities are eliminated. While the construction is not unique it can be considered a minimal way of taking into account the nonequilibrium evolution of the system prior to t0. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.57.6398
DOI:
10.1103/PhysRevD.57.6398
PACS:
11.15.Kc, 11.10.Gh, 11.10.Wx, 98.80.Cq
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