Meson Potential Energy in a Non-Conformal Holographic Model

Abstract

We study the meson potential energy in a non-conformal model at both zero and finite temperature via gauge/gravity duality. This model consists of five-dimensional Einstein gravity coupled to a scalar field with a non-trivial potential. Interestingly, at both zero and finite temperature we find that the relative meson potential energy can be considered as a measure of non-conformality of the theory. At zero temperature we show that parameters of the Cornell potential, i.e. Coulomb strength parameter $\kappa$ and constant $C$ depends on the energy scale $\Lambda$ that breaks conformal symmetry and the difference between the number of degrees of freedom of UV and IR fixed points $\Delta N$ while QCD string tension ${\sigma }_s$ just depends on the $\Lambda$. At finite temperature we see that there is a melting length $l_{m\ell }$ where beyond that the meson dissociates in the plasma and by increasing $\Lambda$ the value of $l_{m\ell }$ increases while its value decreases by increasing the temperature.

arXiv comment12 pages, 14 figures, revision in the figures and the conclusion, accepted for publication in Nucl. Phys. B

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