A Plethora of Cluster Structures on Gln

Download or read book A Plethora of Cluster Structures on Gln written by Michael Gekhtman and published by Ams American Mathematical Society. This book was released on 2024-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We continue the study of multiple cluster structures in the rings of regular functions on GLn, SLn and Matn that are compatible with Poisson-Lie and Poisson-homogeneous structures. According to our initial conjecture, each class in the Belavin-Drinfeld classification of Poisson--Lie structures on a semisimple complex group G corresponds to a cluster structure in O(G). Here we prove this conjecture for a large subset of Belavin-Drinfeld (BD) data of An type, which includes all the previously known examples. Namely, we subdivide all possible An type BD data into oriented and non-oriented kinds. In the oriented case, we single out BD data satisfying a certain combinatorial condition that we call aperiodicity and prove that for any BD data of this kind there exists a regular cluster structure compatible with the corresponding Poisson-Lie bracket. In fact, we extend the aperiodicity condition to pairs of oriented BD data and prove a more general result that establishes an existence of a regular cluster structure on SLn compatible with a Poisson bracket homogeneous with respect to the right and left action of two copies of SLn equipped with two different Poisson-Lie brackets. If the aperiodicity condition is not satisfied, a compatible cluster structure has to be replaced with a generalized cluster structure. We will address this situation in future publications.