Abstract
Using gauge/gravity duality,we studied the exotic hybrid pseudopotentials at finite temperature and chemical potential.The Σ hybrid meson can be described by a model including an object called"defect"on a string linking the quark and antiquark.The Σu-hybrid potential at zero temperature and chemical potential was first pro-posed by Andreev and is perfectly described.In this study,we extended the aforementioned model to finite chemic-al potential and compared the separate distance and pseudopotentials of ∑g+and Σu-.Unlike the Σg+ground state,theΣu-hybrid pseudopotentials no longer exhibit Coulomb-like behavior at short distances.In addition,temperature and chemical potential have a significant impact on the Σu-hybrid pseudopotentials.The screen distances and hybrid pseudopotentials of Σu-significantly decrease when increasing temperature and chemical potential.We represented the melting diagram of Σg+and Σu-in the T-μ plane and confirmed that the quark-antiquark pair in Σu-excited state is easier to melt than that in Σg+ground state.
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