The Kronecker coefficients of the Symmetric group Sn are the
multiplicities of an irreducible Sn representation in the tensor
product of two other irreducibles. They were introduced in 1938 by
Murnaghan and generalize the beloved Littlewood...
Based on https://arxiv.org/abs/2408.11139 .
In this talk we'll explain how self-dual metrics (which correspond
to spacetimes containing only positive helicity gravitons) can be
written as a sum over connected "tree" diagrams, which are
different...