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Complex time route to quantum backreaction
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DOI：10.1140/epjc/s10052-019-7480-2.png)
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摘要
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We consider the backreaction of a quantum system q on an effectively classical degree of freedom C that is interacting with it. The backreaction equation based on the standard path integral formalism gives the so-called 'in-out' backreaction equation, which has several serious pathologies. One can use a different backreaction prescription, referred to as the 'in-in' approach, which resolves all the issues of 'in-out' backreaction equation. However, this procedure is usually invoked in a rather ad hoc manner. Here we provide a rigorous path integral derivation of the 'in-in' approach by exploiting the concept of quantum evolution along complex time contours. It turns out that, this approach can also be used to study both the 'in-in' and 'in-out' backreaction equations in a unified manner.
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PARTICLE CREATION
FIELD THEORY
CLASSICALITY
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4.8
论文数:
1.8W
被引数:
4.7W
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Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in MedicineIF0
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