Abstract: The Griffiths group of degree $i$ of a smooth projective complex
variety is the group of homologically trivial codimension $i$ algebraic
cycles on it modulo algebraic equivalence. We will outline a new method due
to S. Schreieder to detect nontriviality of classes in Griffiths
groups, which was used by him to show that there exist smooth projective
complex varieties with infinite 2-torsion in their degree 3 Griffiths
groups, addressing a question due to C. Shoen. The talk is based on the
preprint https://arxiv.org/abs/2011.15047 by S. Schreieder.
