Repulsive baryonic interactions and lattice QCD observables at imaginary chemical potential

Volodymyr Vovchenko, Attila Pásztor, Zoltán Fodor, Sandor D. Katz, Horst Stoecker

Research output: Contribution to journalArticlepeer-review

69 Scopus citations


The first principle lattice QCD methods allow to calculate the thermodynamic observables at finite temperature and imaginary chemical potential. These can be compared to the predictions of various phenomenological models. We argue that Fourier coefficients with respect to imaginary baryochemical potential are sensitive to modeling of baryonic interactions. As a first application of this sensitivity, we consider the hadron resonance gas (HRG) model with repulsive baryonic interactions, which are modeled by means of the excluded volume correction. The Fourier coefficients of the imaginary part of the net-baryon density at imaginary baryochemical potential – corresponding to the fugacity or virial expansion at real chemical potential – are calculated within this model, and compared with the Nt=12 lattice data. The lattice QCD behavior of the first four Fourier coefficients up to T≃185 MeV is described fairly well by an interacting HRG with a single baryon–baryon eigenvolume interaction parameter b≃1 fm3, while the available lattice data on the difference χ2 B−χ4 B of baryon number susceptibilities is reproduced up to T≃175 MeV.

Original languageEnglish (US)
Pages (from-to)71-78
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - Dec 10 2017

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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