Dynamical soft-wall AdS/QCD

Brian Batell, Tony Gherghetta

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

We present a solution of the five-dimensional gravity-dilaton-tachyon equations of motion with a pure AdS5 metric and a quadratic dilaton and linear tachyon in conformal coordinates. This leads to an infrared soft-wall model where the dilaton profile gives rise to linear Regge trajectories for the four-dimensional mass spectrum of the dual gauge theory. Even though our approach is phenomenological the scalar fields resemble the dilaton and the closed string tachyon of a noncritical string theory. Interestingly, the linear tachyon has the correct profile to imply that chiral symmetry is not restored for highly excited states. Our solution thus provides a dynamical bottom-up model of linear confinement in holographic QCD.

Original languageEnglish (US)
Article number026002
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume78
Issue number2
DOIs
StatePublished - Jul 14 2008

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