Abstract
Spontaneous chiral symmetry breaking is, apart from colour confinement, the most important physical aspect of strong interactions. Virtual quarks and antiquarks of opposite chirality are attracted to each other due to the strong interactions and destabilize the trivial vacuum state. A condensate is formed which gives rise to a nonvanishing expectation value of the bilinear fermionic operator ψψ. Once the temperature is raised, chiral symmetry will be affected and eventually restored in the deconfined phase of QCD. In order to find the temperature dependence of the chiral condensate in the hadronic medium, we use the framework of the hadron resonance gas (HRG) with the partition function ZHRG. From the generic definition follows in this case 〈qq〉 = − ∂ ∂m0 T lnZHRG = 〈qq〉0 + ∑
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