12 may 2022 -- 18:00
Aula Tricerri, DIMaI, Firenze & online
Seminari di Geometria del Dipartimento di Matematica e Informatica "Ulisse Dini" dell'Università di Firenze
Abstract.
I will describe some examples of complete non-compact Ricci-flat metrics in dimension 4, which are called "gravitational instantons." In many cases, these can be compactified complex analytically to rational surfaces. I will also discuss how these gravitational instantons can arise from sequences of degenerating Ricci-flat metrics on the compact K3 surface, through a process called "bubbling".