Seminars

ハドロン物理セミナーでは、気鋭の研究者に最近の研究のお話をしていただきます。

We invite spirited researchers as speakers of the Hadron Physics Seminar.

*  以下の時間は、UTC + 9である日本標準時（JST）です。

*  The schedule below is in terms of Japan Standard Time (JST), namely UTC +9.

Mon, July 6th

Linking baryonic vortices in QCD matter with isospin imbalance

Zebin Qiu (Keio U.)
Room 907 (16:00-18:00)

Abstract: We investigate Abrikosov–Nielsen–Olesen (ANO) vortices in chiral perturbation theory with finite baryon chemical potential $\mu_B$, isospin chemical potential $\mu_I$, and magnetic field. Given the pion mass, both charged and neutral pions condense in the bulk. We reveal two types of vortex strings that coincide with each other in the system: a local ANO vortex of the charged pions, and a global vortex associated with the neutral pion. Remarkably, we demonstrate that a finite $\mu_B$ facilitates the ANO vortex to form topological linking with the closed neutral pion string, realizing a stable soliton homotopic to a Skyrmion. The linking number has the physical meaning of the baryon charge, which reduces the free energy via the Wess-Zumino-Witten term. We further quantify the critical value of $\mu_B$ as a function of $\mu_I$, above which the linking vortices feature lower energy than pure ANO vortices, suggesting a novel phase dubbed Baryonic vortex lattice.