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TMF, 2019, Volume 200, Number 1, Pages 19–49 (Mi tmf9658)  

Cut-and-join operators and Macdonald polynomials from the 3-Schur functions

A. Yu. Morozovab

a Institute for Theoretical and Experimental Physics, Moscow, Russia
b Kharkevich Institute for Information Transmission Problems of the Russian Academy of Sciences, Moscow, Russia

Abstract: Schur polynomials admit a somewhat mysterious deformation to Macdonald and Kerov polynomials, which do not have a direct group theory interpretation but do preserve most of the important properties of Schur functions. Nevertheless, the family of Schur–Macdonald functions is not sufficiently large: for various applications today, we need their not-yet-known analogues labeled by plane partitions, i.e., three-dimensional Young diagrams. Recently, a concrete way to obtain this generalization was proposed, and miraculous coincidences were described, raising hopes that it can lead in the right direction. But even in that case, much work is needed to convert the idea of generalized 3-Schur functions into a justified and effectively working theory. In particular, we can expect that Macdonald functions $($and even all Kerov functions, given some luck$)$ enter this theory on an equal footing with ordinary Schur functions. In detail, we describe how this works for Macdonald polynomials when the vector-valued times, which are associated with plane partitions and are arguments of the 3-Schur functions, are projected onto the ordinary scalar times under nonzero angles that depend on the Macdonald parameters $q$ and $t$. We show that the cut-and-join operators smoothly interpolate between different limit cases. Most of the examples are restricted to level $2$.

Keywords: plane partition, Macdonald polynomial.

Funding Agency Grant Number
Foundation for the Development of Theoretical Physics and Mathematics BASIS
Russian Foundation for Basic Research 16-02-01021
18-51-05015-Arm
18-51-45010-Ind
17-51-50051-YaF
This research is supported in part by the Foundation for the Advancement of Theoretical Physics "BASIS" and the Russian Foundation for Basic Research (Grant No. 16-02-01021 and Joint Grant Nos. 18-51-05015-Arm, 18-51-45010-Ind, and 17-51-50051-YaF).


DOI: https://doi.org/10.4213/tmf9658

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English version:
Theoretical and Mathematical Physics, 2019, 200:1, 938–965

Bibliographic databases:

Received: 06.12.2018
Revised: 06.12.2018

Citation: A. Yu. Morozov, “Cut-and-join operators and Macdonald polynomials from the 3-Schur functions”, TMF, 200:1 (2019), 19–49; Theoret. and Math. Phys., 200:1 (2019), 938–965

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