Effective large-scale model of boson gas from microscopic theory
| Autor: | M. Yu. Nalimov, M. V. Komarova, Yu. G. Molotkov, Juha Honkonen |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Nuclear and High Energy Physics Attenuation Propagator Dissipation 01 natural sciences 010305 fluids & plasmas Perturbation expansion Regularization (physics) 0103 physical sciences lcsh:QC770-798 lcsh:Nuclear and particle physics. Atomic energy. Radioactivity Statistical physics Microscopic theory 010306 general physics Scale model Boson |
| Zdroj: | Nuclear Physics Nuclear Physics B, Vol 939, Iss, Pp 105-129 (2019) |
| ISSN: | 0550-3213 |
| Popis: | An effective large-scale model of interacting boson gas at low temperatures is constructed from first principles. The starting point is the generating function of time-dependent Green functions at finite temperature. The perturbation expansion is worked out for the generic case of finite time interval and grand-canonical density operator with the use of the S-matrix functional for the generating function. Apparent infrared divergences of the perturbation expansion are pointed out. Regularization via attenuation of propagators is proposed and the relation to physical dissipation is studied. Problems of functional-integral representation of Green functions are analyzed. The proposed large-scale model is explicitly renormalized at the leading order. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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