CRC 1225 Seminar Talk: Repulsive interactions in hadron resonance gas, fluctuations of conserved charges and thermodynamics at non-zero baryon density

Speaker: Peter Petreczky (Brookhaven National Laboratory, USA)

Title of Talk: Repulsive interactions in hadron resonance gas, fluctuations of conserved charges and thermodynamics at non-zero baryon density

Abstract: Thermodyanmics of hadronic matter below the chiral crossover temperature can be described by hadron resonance gas (HRG) model.The HRG model was very successful in describing lattice QCD results on QCD equation of state and second order fluctuations of conserved charges.The basic idea of HRG model is that interactions in the hadron gas are dominated by resonances.There are also non-resonant interactions in hadron gas, which are dominantly repulsive.I will discuss the repulsive interactions in the framework of virial expansion and mean-field approach. I will show that repulsive interactions are important for describing the lattice results on higher order fluctuations of conserved charges.Finally, thermodynamics of hadron gas at non-zero density will be discussed in the framework of the repulsive mean-field approach.