Shear viscosity of a pion gas resulting from rho pi pi and sigma pi pi interactions

Autor(es)

Ghosh, Sabyasachi ^[1] ; Krein, Gastao ^[1] ; Sarkar, Sourav ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo - Brazil

^[2] Ctr Variable Energy Cyclotron, Div Theoret Phys, Kolkata 700064 - India

• Tipo de documento: Artigo Científico
• Fonte: Physical Review C; v. 89, n. 4 APR 2 2014.
• Citações Web of Science: 9

Resumo

We have evaluated the shear viscosity of pion gas with vanishing chemical potential taking into account its scattering with the low mass resonances sigma and rho during propagation in the medium. The thermal width (or collisional rate) of pions is calculated from pi sigma and pi rho loop diagrams using effective interactions in the real-time formulation of finite temperature field theory. A very small value of shear viscosity by entropy density ratio (eta/s), close to the quantum bound, is obtained which approximately matches the range of values eta/s used by Niemi et al. {[}H. Niemi, G. S. Denicol, P. Huovinen, E. Molnar, and D. H. Rischke, Phys. Rev. Lett. 106, 212302 (2011); Phys. Rev. C 86, 014909 (2012)] to fit the elliptic flow data from the Relativistic Heavy Ion Collider. (AU)

• Processo FAPESP: 13/01907-0 - Centro de Pesquisa e Análise de São Paulo
• Beneficiário: Sergio Ferraz Novaes
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 12/16766-0 - Propriedades espectrais e de transporte de mesons com charm na matéria hadrônica quente e densa
• Beneficiário: Sabyasachi Ghosh
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 09/50180-0 - Estudo de interações hadrônicas a altas energias
• Beneficiário: Yogiro Hama
• Linha de fomento: Auxílio à Pesquisa - Temático