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Title: Poset subHopf algebras from growth models in causal set theory and quantum field theory

Speaker: Karen Yeats Affiliation: University of Waterloo Location: MC 5501 and Zoom - please contact Oliver Pechenik for the Zoom link

Abstract: In a story some of you have heard from me before, we get subHopf algebras of the Connes-Kreimer Hopf algebra of rooted trees from certain simple tree classes which correspond to solutions to combinatorial analogues of Dyson-Schwinger equations in quantum field theory.  Another important subHopf algebra of the Connes-Kreimer Hopf algebra is the Connes-Moscovici Hopf algebra which can be viewed as coming from rooted trees grown by adding leaves.