Limits of applicability of holographic dual descriptions to QCD: virtuality and coherence

This article likely discusses the challenges and limitations of using holographic duality (a concept from string theory) to understand Quantum Chromodynamics (QCD), the theory of strong interactions. The focus seems to be on how virtuality and coherence, properties of QCD, affect the applicability of holographic models. A deeper analysis would require reading the actual paper to understand the specific limitations discussed and the methods used.