Spectral Functions in V-QCD with Matter: Masses, Susceptibilities, Diffusion and Conductivity

Understand

We consider a holographic model of QCD in the Veneziano limit of a large number of colors $N_c$ and flavors $N_f$ but fixed $x=N_f/N_c$ (V-QCD).

• The model exhibits a first order deconfined but chirally broken transition, followed by a second order chirally restored transition in the $\mu-T$ plane for a range of plausible holographic parameters.
• We study the quasi-normal mode spectrum, and derive the pertinent vector and axial spectral functions across the transition regions.
• The pole masses, susceptibilities, diffusion constants and electric conductivity are also discussed.