Orateur
Description
Chern-Simons terms are necessary to reproduce global flavor anomalies in holographic models of QCD. They are also required to model holographic baryons. We will present how the Chern-Simons action must be generalized in the presence of a bulk tachyon field (dual to the quark bilinear), extending earlier work restricted to flavor-independent quark masses. We will then extend recent work about massless-quarks V-QCD baryons and show that a single baryon compatible with generic quark masses is represented in the gravity dual by a point-like defect. The Tachyon-Chern-Simons action allows us to identify the baryon number with the generalized bulk instanton number. If time permits, we will show that this action produces a Wess-Zumino-Witten term in the boundary effective field theory for the pions and that the baryon current is identified to the boundary Skyrme current.