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- W4308996663 abstract "A common feature of recent functional renormalization group investigations of effective low-energy QCD is the appearance of a back-bending behavior of the chiral phase transition line at low temperatures together with a negative entropy density in the symmetric regime. The regulator scheme dependence of this phenomenon and the necessary modifications at finite densities are analyzed within a two-flavor quark-meson model. The flows at finite densities for three different regulators of three- or four-dimensional momenta are confronted to each other. It is found that the back-bending behavior and the negative entropy density can be traced back to the explicit momentum dependence of the regulator shape function. While it persists for the often-used three-dimensional flat regulator, it vanishes for Callan-Symanzik type regulators. This points to truncation artifacts in the lowest order of the derivative expansion. A careful theoretical as well as numerical exploration is given." @default.
- W4308996663 created "2022-11-20" @default.
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- W4308996663 date "2022-11-14" @default.
- W4308996663 modified "2023-10-18" @default.
- W4308996663 title "Regulator scheme dependence of the chiral phase transition at high densities" @default.
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- W4308996663 doi "https://doi.org/10.1103/physrevd.106.094018" @default.
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