English

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

High Energy Physics - Theory 2015-06-11 v1 Nuclear Theory

Abstract

We consider a holographic model of QCD in the Veneziano limit of a large number of colors NcN_c and flavors NfN_f but fixed x=Nf/Ncx=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 μT\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. In particular, the pole masses are found to survive the deconfining transition, to quickly dissolve in the the chirally restored phase by developing substantial widths. The flavor electric conductivities arise sharply in the transition region. The flavor susceptibility is shown to be consistent with the one derived from bulk thermodynamics.

Keywords

Cite

@article{arxiv.1410.8540,
  title  = {Spectral Functions in V-QCD with Matter: Masses, Susceptibilities, Diffusion and Conductivity},
  author = {Ioannis Iatrakis and Ismail Zahed},
  journal= {arXiv preprint arXiv:1410.8540},
  year   = {2015}
}

Comments

36 pages, 10 figures