Geodesic
The ``free'' quantum Brownian particle as a~non-Fock linear bosonic system
Teoretičeskaâ i matematičeskaâ fizika, Tome 116 (1998) no. 2, pp. 201-214

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We quantize the Langevin equation for a “free” Brownian particle. The corresponding linear bosonic system possesses infrared singularities and is therefore non-Fock. We construct the physical representations of fields using the generalized stationary states. 
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     author = {A. I. Oksak and A. D. Sukhanov},
     title = {The ``free'' quantum {Brownian} particle as {a~non-Fock} linear bosonic system},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {201--214},
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     volume = {116},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1998_116_2_a3/}
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A. I. Oksak; A. D. Sukhanov. The ``free'' quantum Brownian particle as a~non-Fock linear bosonic system. Teoretičeskaâ i matematičeskaâ fizika, Tome 116 (1998) no. 2, pp. 201-214. http://geodesic.mathdoc.fr/item/TMF_1998_116_2_a3/