Amending the Vafa-Witten theorem

作者：Li Chuan; Wang Qing^*

来源：Physics Letters B, 2013, 721(1-3): 141-145.

DOI：10.1016/j.physletb.2013.02.050

The strong version of the Vafa-Witten theorem is shown to likely not hold true because a direct computation of the order parameter has the zero condensate as a result for the symmetric vacuum. Thus, the validity of the Vafa-Witten theorem relies on its weak version, in which the Goldstone boson is absent in the vector-like gauge theories that have a vanishing theta angle. The existence of a charged rho meson condensate, which violates electromagnetic gauge symmetry, is consistent with this weak version of the Vafa-Witten theorem when it is applied to strong magnetic fields in QCD.

• 出版日期2013-4-10
• 单位清华大学