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arXiv 0909.0614hep-th
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夸克-胶子等离子体中全息多夸克的磁性

Magnetic properties of holographic multiquarks in the quark-gluon plasma

Piyabut Burikham

摘要:

本文利用Sakai-Sugimoto模型研究了胶子退禁闭而手征对称性仍然破缺的夸克-胶子等离子体中有色多夸克态的磁性。有两种可能的磁化多夸克组态。两种组态在临界场和温度下收敛到相同的组态,然后它们完全解离成颜色较浅的多夸克或固定密度的其他相。同时还发现,色荷越高的多夸克在磁化强度和手征对称性破缺程度上对外磁场的响应越大。磁场的存在也使得具有大色荷的多夸克态更难满足引力对偶图中位形的平衡条件。只要化学势为$μ> μ_{onset}$,磁化多夸克相在热力学上优于磁化真空。讨论了Sakai-Sugimoto模型的纯π介子梯度和手征对称夸克-胶子等离子体($χ_S$ -QGP)相,并与有磁场存在时的多夸克相进行了比较.结果表明,在大密度和中等外场下,多夸克和π介子梯度的混合相优于$χ_S$ -QGP.

英文摘要:

We study the magnetic properties of the coloured multiquark states in the quark-gluon plasma where the gluons are deconfined and the chiral symmetry is still broken, using the Sakai-Sugimoto model. There are two possible magnetized multiquark configurations. Both configurations converge to the same configuration at the critical field and temperature before they dissociate altogether either into less coloured multiquarks or into other phases for a fixed density. It is also found that the multiquarks with higher colour charges respond more to the external magnetic field in both the magnetization and the degree of chiral symmetry breaking. Magnetic field also makes it more difficult for multiquark states with large colour charges to satisfy the equilibrium condition of the configuration in the gravity dual picture. As long as the chemical potential $μ> μ_{onset}$, the magnetized multiquarks phase is thermodynamically preferred over the magnetized vacuum. Pure pion gradient and the chiral-symmetric quark-gluon plasma ($χ_S$-QGP) phase for the general Sakai-Sugimoto model are discussed and compared with the multiquark phase in the presence of the magnetic field. It is found that at large densities and moderate fields, the mixed phase of multiquarks and the pion gradient is thermodynamically preferred over the $χ_S$-QGP.

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