Nonequilibrium chiral perturbation theory and pion decay functions
We extend chiral perturbation theory to study a meson gas out of thermal equilibrium. Assuming that the system is initially in equilibrium at T-i < T-c and working within the Schwinger-Keldysh contour technique, we define consistently the time-dependent temporal and spatial pion decay functions, the...
| Authors: | ; |
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| Format: | Article |
| Publication date: | 1999 |
| Country: | España |
| Institution: | Universidad Complutense de Madrid (UCM) |
| Repository: | Docta Complutense |
| Language: | English |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/59584 |
| Online Access: | https://hdl.handle.net/20.500.14352/59584 |
| Access Level: | Open access |
| Keyword: | 51-73 Qcd phase-Transition Finite-temperature Equilibrium Evolution Energy Field Física-Modelos matemáticos Física matemática |
| Summary: | We extend chiral perturbation theory to study a meson gas out of thermal equilibrium. Assuming that the system is initially in equilibrium at T-i < T-c and working within the Schwinger-Keldysh contour technique, we define consistently the time-dependent temporal and spatial pion decay functions, the counterparts of the pion decay constants, and calculate them to next to leading order. The link with curved space-time QFT allows to establish nonequilibrium renormalisation. The short-time behaviour and the applicability of our model to a heavy-ion collision plasma are also discussed in this work. |
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