September 10, 2018
TITLE: Compact 7-manifolds with closed G2-structures
ABSTRACT: After reviewing the known examples of compact 7-manifolds admitting a closed -structure, I will describe the construction of a new compact example which is formal and has first Betti number b_1=1. The idea of this construction stems from the study of the original Joyce’s techniques on -orbifold resolutions.
Moreover, I will show the existence of associative calibrated (hence volume-minimizing) 3-tori with respect to this new closed -structure and, for each of those 3-tori, I will show a 2-dimensional family of non-trivial associative deformations.
This is a joint work with Marisa Fernandez, Alexei Kovalev and Vicente Munoz.
June 5, 2018
TITLE: Laplacian flow and special metrics
ABSTRACT: We discuss some results on the behaviour of the Laplacian -flow starting from a closed -structure whose induced metric satisfies suitable extra conditions. In particular we consider the cases when the induced metric is warped or the -structure is extremally Ricci pinched.
The talk is based on joint work with Alberto Raffero.