Restrictions on Symmetry Breaking in Vector-Like Gauge Theories

  title={Restrictions on Symmetry Breaking in Vector-Like Gauge Theories},
  author={C. Vafa and Edward Witten},
  journal={Nuclear Physics},
  • C. Vafa, Edward Witten
  • Published 1984
  • Physics
  • Nuclear Physics
  • Modulo some highly plausible assumptions, we show that vector-like global symmetries (like isospin or baryon number) are not spontaneously broken in vector-like gauge theories with θ = 0 (like QCD). We also show that in these theories massless bound states do not form from massive constituents. 
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