On the spectrum of open strings in the Hard-Wall model of AdS/QCD: the role of S5

Abstract

We revisit the problem of a classical open string representing a meson in the hard-wall geometry and consider the S5 compact space. The existence of a confining region leads to a discrete set of string configurations parameterized by the number n of complete turnarounds S5 great circles. Unlike the conformal case, the string in the bulk can explore S5 even in the case of equal boundary conditions on its endpoints. The string solutions are parameterized by an internal dimensionless conserved charge ln. The qq¯ potential is linear for large separations, and the string tension is sensitive to ln.

Keywords

• Holography
• Open strings
• Hard-wall model
• Compact space