Dealing with tunneling processes in field theory. — Transition to the Euclidean space– time. — Nontriviality of the third homotopy group in Yang–Mills. — Everything you need to know about the Belavin–Polyakov–Schwartz–Tyupkin instanton. — Instanton-induced baryon number violation in the standard model. — What is the holy grail function?
In previous chapters we advanced along the road of increasing codimensions: from codimension 1, for domain walls, to codimension 3 for monopoles and Skyrmions. These objects were considered in the static limit. Now we will pass to objects with codimension 4: instantons . It is clear that in ...