2026-06-08T04:02:21Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/437992024-09-04T14:04:54Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Dobado González, Antonio author Llanes Estrada, Felipe José author Torres Rincón, Juan Miguel author 2009-12 We reexamine the possibility of employing the viscosity over entropy density ratio as a diagnostic tool to identify a Phase transition in hadron physics to the strongly coupled quark-gluon plasma and other circumstances where direct measurement of the order parameter or the free energy may be difficult. It has been conjectured that the minimum of eta/s does indeed occur at the phase transition. We now make a careful assessment in a controlled theoretical framework, the linear sigma model at large N, and indeed find that the minimum of eta/s occurs near the second-order phase transition of the model due to the rapid variation of the order parameter (here the sigma vacuum expectation value) at a temperature slightly smaller than the critical one. 1550-7998 10.1103/PhysRevD.80.114015 https://hdl.handle.net/20.500.14352/43799 http://prd.aps.org/abstract/PRD/v80/i11/e114015 http://prd.aps.org Minimum of eta/s and the phase transition of the linear sigma model in the large-N limit