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### From RSK to cactus group actions on Coxeter groups

**Algebra & Discrete Mathematics**

Speaker: | Noah White, UCLA |

Related Webpage: | http://www.math.ucla.edu/~noah/ |

Location: | 1147 MSB |

Start time: | Mon, Oct 22 2018, 11:00AM |

The cactus group is a combinatorially defined group one can attach to a Coxeter group - an asymptotic version of the braid group. Losev and Bonnafe have described an action of the cactus group on the Coxeter group which is compatible with the Kazhdan-Lusztig cells. In type A this action can be described using the RSK correspondence and Schützenberger involutions. I will describe how this can be realised geometrically and its relation to crystals for the general linear Lie algebra. I will also give an alternative description of the action on a general Coxeter group.