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{\Large Department of Mathematics, BGU}

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\textbf{On} \emph{Wednesday, July 17, 2024}
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\textbf{At} \emph{14:10 -- 15:10}
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\textbf{In} \emph{-101}

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{\large\scshape Anton Khoroshkin 
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  (University of Haifa)
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will talk about
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{\Large\bfseries On generating series of cohomology of generalized configuration spaces\par}
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\textsc{Abstract:}
With each simple connected graph \$G\$ with \$n\$ vertices one can associate a generalized configuration space \$Conf\_\{G\}(n,X)\$ consisting of \$n\$ points \$(p\_1,\textbackslash{}ldots,p\_n)\$ on \$X\$, with \$p\_i\textbackslash{}neq p\_j\$ whenever vertices \$i\$ and \$j\$ are connected by an edge. For \$X=\textbackslash{}mathbb\{C\}\$ the generalized configuration space admits a compactification that coincides for a complete graph with Deligne-Mumford compactification of moduli spaces of rational curves with \$n\$ marked points. The latter is known under the name \emph{modular compactification}. I will explain what kind of natural algebraic structure exists in the union of these spaces and how one can extract information about the Hilbert series of cohomology rings for different collections of graphs.
   Surprisingly, the same method can be used to obtain the generating series for different combinatorial data assigned with a graph: such as the number of Hamiltonian paths, Hamiltonian cycles, Acyclic orientations and Chromatic polynomials.
   The talk is based on the joint work with my student D.Lyskov: https://arxiv.org/abs/2406.05909








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