Speaker
Description
It was shown recently that vorticity manifesting from space-time torsion can be treated as an effective axial gauge field coupled to Dirac fermions in a flat spacetime. Motivated by this, we investigate the anomalous effects induced by vorticity, magnetic fields and chemical potentials on Nambu-Goldstone modes. Starting from a linear sigma model, I shall outline how to derive the Wess-Zumino-Witten effective action in the presence of external vector, axial-vector, and pseudo-scalar fields using a derivative expansion of the fermionic determinant. From this effective action, I will point out a new anomalous term that involves charged pions and vorticity. I will then briefly discuss the possible phenomenological implications of this new term.