Fluctuation-induced modifications of the phase structure in (2+1)-flavor QCD

Abstract

The low-energy sector of QCD with $N_f=2+1$ dynamical quark flavors at non-vanishing chemical potential and temperature is studied with a non-perturbative functional renormalization group method. The analysis is performed in different truncations in order to explore fluctuation-induced modifications of the quark-meson correlations as well as quark and meson propagators on the chiral phase transition of QCD. Depending on the chosen truncation significant quantitative implications on the phase transition are found. In the chirally symmetric phase, the quark flavor composition of the pseudoscalar $(\eta ,{\eta }^{\prime })$-meson complex turns out to be drastically sensitive to fluctuation-induced modifications in the presence of the axial $U(1{)}_A$ anomaly. This has important phenomenological consequences for the assignment of chiral partners to these mesons.

21 pages, 9 figures; v2: published version

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• Hyper-order baryon number fluctuations at finite temperature and density
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• Strangeness neutrality and baryon-strangeness correlations
• Baryon number fluctuations in the 2+1 flavor low energy effective model
• Tachyonic instability of the scalar mode prior to QCD critical point based on Functional renormalization-group method
• Real-time dynamics of the $O(4)$ scalar theory within the fRG approach
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• New Insight about the Effective Restoration of U_A(1) Symmetry
• Thermal behavior of effective U_A(1) anomaly couplings in reflection of higher topological sectors
• New insight on the quark condensate beyond chiral limit
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• Chiral criticality and glue dynamics
• Range of topological fluctuations in the three-flavor linear sigma model