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- W4382618744 abstract "Let $mathfrak{g}$ be an untwisted affine Lie algebra with associated Weyl group $W_a$. To any level 0 weight $gamma$ we associate a weighted graph $Gamma_gamma$ that encodes the orbit of $gamma$ under the action $W_a$. We show that the graph $Gamma_gamma$ encodes the periodic orientation of certain subsets of alcoves in $W_a$ and therefore can be interpreted as an automaton determining the reduced expressions in these subsets. Then, by using some relevant quotients of the homology ring of affine Grassmannians, we show that $Gamma_gamma$ is positively multiplicative. This allows us in particular to compute the structure constants of the homology rings using elementary linear algebra on multiplicative graphs. In another direction, the positivity of $Gamma_gamma$ yields the key ingredients to study a large class of central random walks on alcoves." @default.
- W4382618744 created "2023-06-30" @default.
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- W4382618744 date "2023-06-28" @default.
- W4382618744 modified "2023-09-27" @default.
- W4382618744 title "Homology rings of affine grassmannians and positively multiplicative graphs" @default.
- W4382618744 doi "https://doi.org/10.48550/arxiv.2306.16105" @default.
- W4382618744 hasPublicationYear "2023" @default.
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