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arXiv 2105.03218hep-phhep-thnucl-th
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全息重子物质中的同位旋不对称性

Isospin asymmetry in holographic baryonic matter

Nicolas Kovensky, Andreas Schmitt

摘要:

我们研究重子物质的同位旋不对称性,包括完全动态的相互作用与π凝聚。为此,我们采用全息Witten-Sakai-Sugimoto模型和所谓的体块规范场的齐次近似来描述重子物质。在有限的几何形状和限制自己的手征极限,我们映射出的相结构中存在的重子和同位旋化学势,表明足够大的化学势凝聚π介子和同位旋不对称重子物质共存。我们还提出了第一个结果,同样的方法在退限制几何和证明,这种情况下,虽然技术上更多的参与,更适合与现实世界的QCD的比较和预测。我们的研究奠定了基础,为未来改进全息研究,旨在对电荷中性,β平衡的物质在紧凑的恒星的现实描述,也为更精细的比较与晶格研究在非零的同位旋化学势。

英文摘要:

We study baryonic matter with isospin asymmetry, including fully dynamically its interplay with pion condensation. To this end, we employ the holographic Witten-Sakai-Sugimoto model and the so-called homogeneous ansatz for the gauge fields in the bulk to describe baryonic matter. Within the confined geometry and restricting ourselves to the chiral limit, we map out the phase structure in the presence of baryon and isospin chemical potentials, showing that for sufficiently large chemical potentials condensed pions and isospin-asymmetric baryonic matter coexist. We also present first results of the same approach in the deconfined geometry and demonstrate that this case, albeit technically more involved, is better suited for comparisons with and predictions for real-world QCD. Our study lays the ground for future improved holographic studies aiming towards a realistic description of charge neutral, beta-equilibrated matter in compact stars, and also for more refined comparisons with lattice studies at nonzero isospin chemical potential.

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