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Equation of state at finite net-baryon density using Taylor coefficients up to sixth order

We employ the lattice QCD data on Taylor expansion coefficients up to sixth order to construct an equation of state at finite net-baryon density. When we take into account how hadron masses depend on lattice spacing and quark mass, the coefficients evaluated using the p4 action are equal to those of hadron resonance gas at low temperature. Thus the parametrised equation of state can be smoothly connected to the hadron resonance gas equation of state. We see that the equation of state using Taylor coefficients up to second order is realistic only at low densities, and that at densities corresponding to s/n_B > 40, the expansion converges by the sixth order term.

preprint2014arXivOpen access
Pasi HuovinenPeter PetreczkyChristian Schmidt
hep-latnucl-th
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Pasi HuovinenPeter PetreczkyChristian Schmidt

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