QCD Equation of State and Hadron Resonance Gas

By P. Huovinen, P. Petreczky. 2009

419 citations recorded by the source corpus.

We compare the trace anomaly, strangeness and baryon number fluctuations calculated in lattice QCD with expectations based on hadron resonance gas model. We find that there is a significant discrepancy between the hadron resonance gas and the lattice data. This discrepancy is largely reduced if the hadron spectrum is modified to take into account the larger values of the quark mass used in lattice calculations as well as the finite lattice spacing errors. We also give a simple parametrization of QCD equation of state, which combines hadron resonance gas at low temperatures with lattice QCD at high temperatures. We compare this parametrization with other parametrizations of the equation of state used in hydrodynamical models and discuss differences in hydrodynamic flow for different equations of state.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8590a27ba2a52902e787a629b8e3f7d29403d551

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In Nuclear and High Energy Physics

1. S. Gubser
2. C. Fischer
3. T. Schaefer
4. Zoltán Fodor
5. P. Braun-Munzinger
6. J. Stachel
7. V. Koch
8. Sándor D. Katz

Citations in the corpus

• Relativistic Hydrodynamics in Heavy-Ion Collisions: General Aspects and Recent Developments (2016, methodology): “3 shows the trace anomaly calculated in lattice QCD with p4 and asqtad actions on Nτ = 6 and 8 lattices [141] compared with various parametrizations given by the solid, dotted and dashed lines [139].”
• Is there still any Tc mystery in lattice QCD? Results with physical masses in the continuum limit III (2010, methodology): “An interesting application of these observations was studied in [13, 14].”
• Properties of hot and dense matter from relativistic heavy ion collisions (2015, background): “A realistic EOS has to match lattice QCD results at high temperature, and a hadronic resonance gas below Tc [201].”
• Technical (1960, neutral): “This necessitates a modern data collection framework that not only features high-performance real-time processing and precise time synchronization but also natively supports the fusion of various collection methods in its architecture to meet the growing demand for high-quality, multi-modal, and…”
• The QCD equation of state with dynamical quarks (2010, methodology): “References [19] and [21] presented a possible explanation for this problem: the more severe discretization artefacts of the “asqtad” and “p4fat” actions used by the “hotQCD” collaboration lead to larger transition temperatures.”
• Extraction of heavy-flavor transport coefficients in QCD matter (2018, methodology): “• POWLANG: HQ Langevin transport in the ECHO-QGP 3+1D viscous hydrodynamic evolution with lQCD-based EoS, starting time τ0=0.6 fm and final QGP temperature of Tc=155 MeV [47].”
• Gauge/String Duality, Hot QCD and Heavy Ion Collisions (2011, background): “It is not possible to get as small a value of η/s as the data requires (3)Recent analyses that include equations of state based upon parametrizations of recent lattice calculations [119] and include dissipative effects from the late-time hadron gas epoch as well as estimates of the effects of bulk v”
• The effects of QCD equation of state on the relic density of WIMP dark matter (2015, methodology): “We exploit recent calculations performed in the framework of the Hadron Resonance Gas (HRG) model well below the deconfinement transition [27], smoothly matching to results from lattice QCD (LQCD) at T = 100 MeV [28].”