Add a new page:
Sphalerons are an important part of several proposed solutions of the Baryon asymmetry problem such as Leptogenesis.
A sphaleron is a maximum of the energy functional in the direction of changing winding number, and a minimum in the orthogonal direction. Thus it is a saddle point. (page 336 in An introduction to gauge theories and modern particle physics by E. Leader and E. Predazzi.)