The case of equivalence of low and high energy constraints on Regge vector spectrum in AdS/QCD

TL;DR

This paper investigates whether low and high energy constraints in an AdS/QCD model produce similar parameters for the Regge-like spectrum of mesons, revealing an unexpected near-equivalence despite the non-conformal nature of QCD.

Contribution

It demonstrates that under certain assumptions, low and high energy bounds yield nearly identical parameters for the meson spectrum in an AdS/QCD model.

Findings

Low and high energy constraints produce similar spectrum parameters.

The near-coincidence is surprising given QCD's non-conformal nature.

Supports the idea of universality in holographic QCD models.

Abstract

The AdS/QCD models are believed to interpolate between low and high energy sectors of QCD. This belief is usually based on observations that many phenomenologically reasonable predictions follow from bounds imposed at high energies although the hypothetical range of applicability of semiclassical bottom-up holographic models is restricted by the gauge/gravity duality to low energies where QCD is strongly coupled. For testing the feasibility of high energy constraints it is interesting to calculate holographically some observable constants at low and high momenta independently and compare. We consider an AdS/QCD model describing the Regge-like linear spectrum of spin-1 mesons in a general form and show that under definite physical assumptions, the low-energy constraints on 2-point correlation functions lead to nearly the same numerical values for the parameters of linear radial spectrum as the high energy ones. The found approximate coincidence looks surprising in view of the fact that such a property for observables is natural for conformal theories while real strong interactions are not conformal.