Vafa–Witten theorem

In theoretical physics, the Vafa–Witten theorem, named after Cumrun Vafa and Edward Witten, is a theorem that shows that vector-like global symmetry, global symmetries (those that transform as expected under reflections) such as isospin and baryon number in vector-like gauge theories like quantum chromodynamics cannot be spontaneous symmetry breaking, spontaneously broken as long as the theta vacuum, theta angle is zero. This theorem can be proved by showing the exponential fall off of the propagator of fermions.

See also

*F-theory

References

*
*

Gauge theories
Theorems in quantum mechanics

{{quantum-stub