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

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