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NJL模型中色超导的重整化群一致处理

Renormalization-group consistent treatment of color superconductivity in the NJL model

Hosein Gholami, Marco Hofmann, Michael Buballa

AI总结:

本研究将重整化群一致性方法推广至NJL模型,消除截断伪影,从而能在高密度下研究色超导,并揭示CFL相熔化中出现dSC相。

摘要:

Nambu-Jona-Lasinio (NJL) 模型,特别是其扩展到色超导 (CSC) 的形式,是研究致密夸克物质的一种流行的有效模型。然而,其结果的可靠性受到截断伪影的挑战,当温度或化学势与截断能标同数量级时,这些伪影就会出现。在本工作中,我们将 [Braun et al. SciPost Phys., 6:056, 2019] 中的一个思想推广到 NJL 模型,该思想基于重整化群 (RG) 一致性的要求,并已成功应用于两味夸克-介子-双夸克模型。我们针对电中性和色中性的三味色超导夸克物质应用该思想。为此,我们分析了模型的中等发散,并通过引入三种不同的方案,用适当的抵消项消除这些发散。我们表明,RG 一致的处理消除了传统正则化中的截断伪影,使得该模型能够研究更高密度下的 CSC 物质。我们的研究揭示了在高化学势下,Color-Flavor Locked (CFL) 相的熔化图案中出现所谓的 d-夸克超导 (dSC) 相,这与早期的 Ginzburg-Landau 分析一致。

英文摘要:

The Nambu-Jona-Lasinio (NJL) model and specifically its extension to color superconductivity (CSC) is a popular effective model for investigating dense quark matter. However, the reliability of its results is challenged by cutoff artifacts, which emerge if temperature or chemical potential are of the order of the cutoff energy scales. In this work, we generalize an idea from [Braun et al. SciPost Phys., 6:056, 2019], which is based on the requirement of renormalization-group (RG) consistency and has successfully been applied to the two-flavor Quark-Meson-Diquark model, to the NJL model for electrically and color-neutral three-flavor color-superconducting quark matter. To this end, we analyze the medium divergences of the model and eliminate them by appropriate counterterms, introducing three different schemes. We show that the RG-consistent treatment removes the cutoff artifacts of the conventional regularization and enables the investigation of CSC matter at higher densities by the model. Our studies reveal the emergence of a so-called d-quark superconducting (dSC) phase within the melting pattern of the Color-Flavor Locked (CFL) phase at high chemical potentials, consistent with earlier Ginzburg-Landau analyses.

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