Magnetic properties of confined holographic QCD

6th International Symposium on Quantum Theory and Symmetries

Bergman, Oren^1 ; Lifschytz, Gilad^2 ; Lippert, Matthew^1,2,3

Department of Physics, Technion, Haifa 32000, Israel^1

Department of Mathematics and Physics, University of Haifa, Tivon 36006, Israel^2

Crete Center for Theoretical Physics, University of Crete, Heraklion 71003, Crete, Greece^3

关键词: Baryon chemical potential;    Baryonic matter;    Chern-Simons term;    Chiral symmetry;    Critical magnetic field;    Critical value;    Mixed phase;    Second-order phase transition;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/462/1/012030/pdf
DOI  :  10.1088/1742-6596/462/1/012030

来源: IOP

【 摘 要 】

We investigate the Sakai-Sugimoto model at nonzero baryon chemical potential in a background magnetic field in the confined phase where chiral symmetry is broken. The D8-brane Chern-Simons term holographically encodes the axial anomaly and generates a gradient of the η' meson, which carries a non-vanishing baryon charge. Above a critical value of the chemical potential, there is a second-order phase transition to a mixed phase which includes also ordinary baryonic matter. However, at fixed baryon charge density, the matter is purely η'-gradient above a critical magnetic field.