Radiation Gauge in AdS/QCD: inadmissibility and implications on spectral functions in the deconfined phase

Abstract

We point out a subtlety in choosing the radiation gauge (A_z=0 combined with the Lorenz gauge) for gauge fields in AdS/QCD for black hole backgrounds. We then demonstrate the effect of this on the momentum-dependence of the spectral functions of the J/psi vector meson, showing a spreading with momentum and a breaking of isotropy, in contrast to previous results in the literature. We also discuss the dependence on a background magnetic field, following our earlier proposed model.

10 pages, v2: added reference, version accepted for publication

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• Holographic estimate of heavy quark diffusion in a magnetic field
• Configuration entropy description of charmonium dissociation under the influence of magnetic fields
• Quasinormal modes for quarkonium in a plasma with magnetic fields
• Probing Quarkonium Diffusion in a Magnetized Quark-Gluon Plasma