کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4665381 | 1633806 | 2015 | 45 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Extremal part of the PBW-filtration and nonsymmetric Macdonald polynomials Extremal part of the PBW-filtration and nonsymmetric Macdonald polynomials](/preview/png/4665381.png)
Given a reduced irreducible root system, the corresponding nil-DAHA is used to calculate the extremal coefficients of nonsymmetric Macdonald polynomials in the limit t→∞t→∞ and for antidominant weights, which is an important ingredient of the new theory of nonsymmetric q-Whittaker function. These coefficients are pure q -powers and their degrees are expected to coincide in the untwisted setting with the extremal degrees of the so-called PBW-filtration in the corresponding finite-dimensional irreducible representations of the simple Lie algebras for any root systems. This is a particular case of a general conjecture in terms of the level-one Demazure modules. We prove this coincidence for all Lie algebras of classical type and for G2G2, and also establish the relations of our extremal degrees to minimal q-degrees of the extremal terms of the Kostant q-partition function; they coincide with the latter only for some root systems.
Journal: Advances in Mathematics - Volume 282, 10 September 2015, Pages 220–264