| Journal: | Brazilian journal of physics |
| Database: | PERIÓDICA |
| System number: | 000389451 |
| ISSN: | 0103-9733 |
| Authors: | Ghosh, Sabyasachi1 |
| Institutions: | 1Universidade Estadual Paulista "Julio de Mesquita Filho", Instituto de Fisica Teorica, Sao Paulo. Brasil |
| Year: | 2015 |
| Season: | Dic |
| Volumen: | 45 |
| Number: | 6 |
| Pages: | 687-698 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | Owing to the Kubo relation, the shear viscosities of pionic and nucleonic components have been evaluated from their corresponding retarded correlators of viscous stress tensor in the static limit, which become non-divergent only for the non-zero thermal widths of the constituent particles. In the real-time thermal field theory, the pion and nucleon thermal widths have respectively been obtained from the pion self-energy for different meson, baryon loops, and the nucleon self-energy for different pion-baryon loops. We have found non-monotonic momentum distributions of pion and nucleon thermal widths, which have been integrated out by their respective Bose-enhanced and Pauliblocked phase space factors during evaluation of their shear viscosities. The viscosity to entropy density ratio for this mixed gas of pion-nucleon system decreases and approaches its lower bound as the temperature and baryon chemical potential increase within the relevant domain of hadronic matter |
| Disciplines: | Física y astronomía |
| Keyword: | Física nuclear, Materia hadrónica, Viscosidad al corte, Teoría de campo térmico |
| Keyword: | Physics and astronomy, Nuclear physics, Hadronic matter, Shear viscosity, Thermal field theory |
| Full text: | Texto completo (Ver PDF) |
