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arXiv · 1608.04580

Applicability of the Wigner functional approach to evolution of quantum fields

Andrey Leonidov·Anna Radovskaya
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Abstract

Evolution of highly excited quantum field is considered in the framework of Keldysh formalism . It is demonstrated that leading order (LO) term of semiclassical approximation appears as well-known Classical Statistical Approximation (CSA). In simple case of spatially homogeneous scalar field analytical expressions for leading and next-to-leading (NLO) order are presented. It is shown that the range of applicability of CSA strongly depends on the properties of the initial state of the system

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Andrey Leonidov, Anna Radovskaya. 2016-08-16. Applicability of the Wigner functional approach to evolution of quantum fields. https://doi.org/10.1051/epjconf/201612505013

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