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Abstract: We study the magnetic properties of the coloured multiquark states in thequark-gluon plasma where the gluons are deconfined and the chiral symmetry isstill broken, using the Sakai-Sugimoto model. There are two possible magnetizedmultiquark configurations. Both configurations converge to the sameconfiguration at the critical field and temperature before they dissociatealtogether either into less coloured multiquarks or into other phases for afixed density. It is also found that the multiquarks with higher colour chargesrespond more to the external magnetic field in both the magnetization and thedegree of chiral symmetry breaking. Magnetic field also makes it more difficultfor multiquark states with large colour charges to satisfy the equilibriumcondition of the configuration in the gravity dual picture. As long as thechemical potential $\mu > \mu {onset}$, the magnetized multiquarks phase isthermodynamically preferred over the magnetized vacuum. Pure pion gradient andthe chiral-symmetric quark-gluon plasma $\chi S$-QGP phase for the generalSakai-Sugimoto model are discussed and compared with the multiquark phase inthe presence of the magnetic field. It is found that at large densities andmoderate fields, the mixed phase of multiquarks and the pion gradient isthermodynamically preferred over the $\chi S$-QGP.



Autor: Piyabut Burikham

Fuente: https://arxiv.org/







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