Holographic QCD with Topologically Charged Domain-Wall/Membranes

Understand

We study the thermodynamical phase structures of holographic QCD with nontrivial topologically charged domain-wall/membranes which are originally related to the multiple $\theta$-vacua in the large $N_c$ limit.

• We realize the topologically charged membranes as the holographic D6-brane fluxes in the Sakai-Sugimoto model.
• The D6-brane fluxes couple to the probe D8-anti-D8 via Chern-Simon term, and act as the source for the baryonic current density of QCD.
• We find rich phase structures of the dual meson system by varying asymptotic separation of D8 and anti-D8.