Introduces a new thermodynamic state function enabling computation of high-order temperature fluctuations in hot QCD matter from heavy-ion collision data, predicting strong suppression and negative skewness in the QGP phase.
Baryon number fluctuations at finite temperature and density
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abstract
We investigate baryon number fluctuations for finite temperature and density in two-flavor QCD. This is done within a QCD-improved low-energy effective theory in an extension of the approach put forward in [1,2]. In the present work we aim at improving the predictive power of this approach for large temperatures and density, that is, for small collision energies. This is achieved by taking into account the full frequency dependence of the quark dispersion. This ensures the necessary Silver Blaze property of finite density QCD for the first time, which so far was only implemented approximately. Moreover, we show that Polyakov loop fluctuations have a sizeable impact at large temperatures and density. The results for the kurtosis of baryon number fluctuations are compared to previous effective theory results, lattice results and recent experimental data from STAR.
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Including mesonic fluctuations beyond mean field in the quark-meson-diquark model substantially modifies the phase structure, with diquark condensation dominating at strong couplings as revealed by pole masses and the Silver-Blaze property.
In the random phase approximation, a convenient renormalization scheme for momentum-dependent meson self-energies shows that the moat regime extent in the QCD phase diagram depends critically on in-medium quark-meson interactions.
Strangeness neutrality imposes a constraint linking baryon-strangeness correlations to the QCD equation of state, with their dependence on freeze-out conditions computed in a 2+1 flavor Polyakov-quark-meson model using the functional renormalization group.
citing papers explorer
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High-order fluctuations of temperature in hot QCD matter
Introduces a new thermodynamic state function enabling computation of high-order temperature fluctuations in hot QCD matter from heavy-ion collision data, predicting strong suppression and negative skewness in the QGP phase.
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Diquark Correlators and Phase Structure in the Quark-Meson-Diquark Model beyond Mean Field
Including mesonic fluctuations beyond mean field in the quark-meson-diquark model substantially modifies the phase structure, with diquark condensation dominating at strong couplings as revealed by pole masses and the Silver-Blaze property.
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Dissecting the moat regime at low energies I: Renormalization and the phase structure
In the random phase approximation, a convenient renormalization scheme for momentum-dependent meson self-energies shows that the moat regime extent in the QCD phase diagram depends critically on in-medium quark-meson interactions.
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Strangeness neutrality and the QCD phase diagram
Strangeness neutrality imposes a constraint linking baryon-strangeness correlations to the QCD equation of state, with their dependence on freeze-out conditions computed in a 2+1 flavor Polyakov-quark-meson model using the functional renormalization group.