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The discontinuities of conformal transitions and mass spectra of V-QCD

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arxiv 1309.2286 v1 pith:SICPD37V submitted 2013-09-09 hep-ph hep-lathep-th

Daniel Arean , Ioannis Iatrakis , Matti Jarvinen , Elias Kiritsis This is my paper · ORCID
classification hep-phhep-lathep-th
keywords conformalspectrafoundinfinitymassesregimetransitionv-qcd
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Zero temperature spectra of mesons and glueballs are analyzed in a class of holographic bottom-up models for QCD in the Veneziano limit, N_c -> infinity, N_f -> infinity, with x = N_f/N_c fixed (V-QCD). The backreaction of flavor on color is fully included. It is found that spectra are discrete and gapped (modulo the pions) in the QCD regime, for x below the critical value x_c where the conformal transition takes place. The masses uniformly converge to zero in the walking region x -> x_c^- due to Miransky scaling. All the ratios of masses asymptote to non-zero constants as x -> x_c^- and therefore there is no "dilaton" in the spectrum. The S-parameter is computed and found to be of O(1) in units of N_f N_c in the walking regime, while it is always an increasing function of x. This indicates the presence of a subtle discontinuity of correlation functions across the conformal transition at x = x_c.

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Cited by 3 Pith papers

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    hep-ph 2025-07 conditional novelty 7.0 of 10

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  3. The nucleon structure from an AdS/QCD model in the Veneziano limit

    nucl-th 2025-02 reject novelty 4.0 of 10

    Using the VQCD holographic model, the authors compute four sets of proton observables that match experiment and lattice data, but many inputs are fitted rather than predicted.

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