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NPA Seminar: Paolo Parotto, Penn State, “Finite density equation of state from lattice QCD: recent results from an alternative expansion”
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WL 216
WL 216
Description
Exploring the Quantum Chromodynamics (QCD) phase diagram has been the goal of extraordinary research efforts from theory and experiment alike. Knowledge of the QCD equation of state at finite temperature and density is crucial to support simulations of heavy-ion collisions. Although lattice simulations are the main tool of investigation for QCD thermodynamics, the determination of the equation of state of QCD at finite chemical potential from direct simulations is hindered by the fermion sign problem. Extrapolations of different nature, from zero or imaginary chemical potential, have been widely exploited to circumvent this issue. I will present a new resummation of the Taylor series which, with the aid of simulations at imaginary chemical potential, allows one to extrapolate the equation of state to chemical potentials up to $\mu_B/T = 3.5$. The same procedure is carried out both with and without enforcing the strangeness neutrality condition typical of heavy-ion collisions. In addition, I present a first extrapolation beyond exact strangeness neutrality, constructed through an expansion in the strangeness-to-baryon density ratio.
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