Marco Usula (Oxford) will talk in the geometry seminar on 9th March, at 2pm in the Salle des Profs (9th floor building NO). Marco’s title is “Nahm poles and 0-instantons” and his abstract is below.
A conformally compact manifold is a complete Riemannian manifold with asymptotically negative curvature and with smooth compactification. We discuss the Yang–Mills equations in this geometric context. It turns out that one can consider “standard” (i.e. smooth up to infinity) solutions, or solutions with a more complicated singularity (a “Nahm pole”) at infinity. We discuss a perturbative result in the standard case, along with a more complicated boundary value problem for singular instantons in dimension 4.