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We obtain the thermal photon and dilepton production rates in a stronglycoupled quark-gluon plasma (QGP) at both zero and nonzero baryon chemicalpotential using a bottom-up Einstein-Maxwell-Dilaton (EMD) holographic modelthat is in good quantitative agreement with the thermodynamics of$(2+1)$-flavor lattice QCD around the crossover transition for baryon chemicalpotentials up to 400 MeV, which may be reached in the beam energy scan (BES) atRHIC. We find that increasing the temperature $T$ and the baryon chemicalpotential $\mu_B$ enhances the peak present in both spectra. We also obtain theelectric charge susceptibility, the DC and AC electric conductivities and theelectric charge diffusion as functions of $T$ and $\mu_B$. We find thatelectric diffusive transport is suppressed as one increases $\mu_B$. At zerobaryon density, we compare our results for the DC electric conductivity and theelectric charge diffusion with the latest lattice data available for theseobservables and find reasonable agreement around the crossover transition.Therefore, our holographic results may be used to constraint the magnitude ofthe thermal photon and dilepton production rates in a strongly coupled QGP,which we found to be at least one order of magnitude below perturbativeestimates.

Thermal photon and dilepton production and electric charge transport in a baryon rich strongly coupled QGP from holography