[seminar] [DANAS 15h]: T. Prokopec, Decoherence in Quantum Field Theory

[Kresimir Kumericki]

Prirodoslovno-matematicki fakultet
FIZICKI ODSJEK 
Bijenicka c. 32, Zagreb, Hrvatska

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                     SEMINAR  TEORIJSKE  FIZIKE
(Zajednicki seminari Fizickog odsjeka PMF-a te Odjela za fiziku IRB-a)

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Decoherence in Quantum Field Theory

dr. Tomislav Prokopec

Institute for Theoretical Physics and Spinoza Institute,
Utrecht University, Netherlands

Datum: 17. ozujka 2011. (cetvrtak)
Vrijeme: 15 sati c.t.
Mjesto: PMF, Fizicki odsjek, Bijenicka c. 32, F-201


Sazetak:

  We suggest the gaussian von Neumann entropy as a measure of
decoherence and classicality in quantum field theory (QFT). We then
apply this idea to an interacting scalar field theory. We show how the
process of decoherence and classicisation can be observed in the context
of a renormalised perturbative field theory. By making use of a quantum
mechanical example, we compare our approach with the commonly used
reduced density matrix approach to decoherence, and point out at the
shortcomings of the latter approach.     

2011-03-09 

Voditelj seminara:
dr. Kresimir Kumericki (kkumer at phy.hr)