The Yangian associated with the binary tree

Abstract

In this article, we give three candidates for a definition of the Yangian associated with the binary tree $X^*$ and the group $Aut(X^*)$ consisting of automorphisms of $X^*$ which preserve the tree structure. The first candidate has the Schur-Weyl duality with one kind of an extension of the degenerate affine Hecke algebra. The second and third ones have a homomorphism corresponding to the wreath recursion.