2026-06-07T23:49:26Zhttps://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

Minimum of eta/s and the phase transition of the linear sigma model in the large-N limit Dobado González, Antonio Llanes Estrada, Felipe José Torres Rincón, Juan Miguel 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. 2023-06-20T03:32:30Z 2023-06-20T03:32:30Z 2023-06-20T03:32:30Z 2009-12 journal article https://hdl.handle.net/20.500.14352/43799 1550-7998 10.1103/PhysRevD.80.114015 eng FPA2007-29115-E PR34-1856-BSCH FPA2008-00592 FIS2008-01323 GR58/08 910309 PR34/07-15875 open access American Physical Society