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Lattice-based QCD equation of state at finite baryon density: Cluster Expansion Model

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arxiv 1807.06472 v1 pith:YPNO4KS6 submitted 2018-07-16 hep-lat hep-phnucl-th

V. Vovchenko , J. Steinheimer , O. Philipsen , A. Pasztor , Z. Fodor , S.D. Katz , H. Stoecker This is my paper · ORCID
classification hep-lathep-phnucl-th
keywords baryondensityexpansionmodelclustercoefficientsequationfinite
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abstract

The QCD equation of state at finite baryon density is studied in the framework of a Cluster Expansion Model (CEM), which is based on the fugacity expansion of the net baryon density. The CEM uses the two leading Fourier coefficients, obtained from lattice simulations at imaginary $\mu_B$, as the only model input and permits a closed analytic form. Excellent description of the available lattice data at both $\mu_B = 0$ and at imaginary $\mu_B$ is obtained. We also demonstrate how the Fourier coefficients can be reconstructed from baryon number susceptibilities.

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  1. Critical point signatures in the cluster expansion in fugacities

    hep-ph 2019-09 conditional novelty 7.0 of 10

    In the trivirial model, cluster expansion coefficients b_k have asymptotics b_k ~ A e^{-k μ_R/T} k^{-α} sin(...), switching behavior at the critical temperature, and fitting the first four coefficients to lattice data...

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