Minimum of eta/s and the phase transition of the linear sigma model in the large-N limit

作者：Dobado Antonio^*; Llanes Estrada Felipe J; Torres Rincon Juan M

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009, 80(11): 114015.

DOI：10.1103/PhysRevD.80.114015

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.

• 出版日期2009-12