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arXiv 2205.03072hep-phhep-lat
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三味QCD的热力学和低温夸克凝聚

Thermodynamics and quark condensates of three-flavor QCD at low temperature

Jens O. Andersen, Qing Yu, Hua Zhou

摘要:

我们用三味手征微扰理论($χ$ PT)计算了有限温度下处于受限相的QCD的压力、光和$s$ -夸克凝聚到${\cal O}(p^6)$的低能展开。我们还将电磁效应计入$e^2$阶,其中电磁耦合$e$计入$p$阶。我们的压力和冷凝的结果表明,$χ$ PT收敛非常好的温度高达约150兆电子伏。通过加入重子和介子,我们将$χ$ PT和强子共振气体(HRG)模型结合起来。我们的结果进行了比较,晶格模拟和d的协议是非常好的温度低于{170} MeV,在对比的结果,从$χ$ PT同意晶格只有$T\approx120$ MeV。我们的手性交叉温度值为160.1 MeV,这与$157.3$ MeV的晶格结果相比是有利的。

英文摘要:

We use three-flavor chiral perturbation theory ($χ$PT) to calculate the pressure, light and $s$-quark condensates of QCD in the confined phase at finite temperature to ${\cal O}(p^6)$ in the low-energy expansion. We also include electromagnetic effects to order $e^2$, where the electromagnetic coupling $e$ counts as order $p$. Our results for the pressure and the condensates suggest that $χ$PT converges very well for temperatures up to approximately 150 MeV. We combine $χ$PT and the Hadron Resonance Gas (HRG) model by adding heavier baryons and mesons. Our results are compared with lattice simulations an d the agreement is very good for temperatures below {170} MeV, in contrast to the results from $χ$PT which agree with the lattice only up to $T\approx120$ MeV. Our value for the chiral crossover temperature is 160.1 MeV, which compares favorably to the lattice result of $157.3$ MeV.

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