A combinatorial description of the Gindikin-Karpelevich formula
Page: 1-70
2012
- 35Usage
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Thesis / Dissertation Description
The Gindikin-Karpelevich formula expresses the value of a certain p-adic integral over an algebraic group G as a product over the positive root system corresponding to the Langlands dual group Gv of G. We use the Young tableaux realization of the crystal basis B(∞) for the negative part of the quantum group corresponding to Gv to expand the latter product as a sum over the crystal B(∞). In other words, we define a statistic on tableaux which yields the appropriate co-efficient in the sum. This expansion is achieved when the crystal B(∞) is of non-exceptional finite type or type G 2. We also interpret our statistic on tableaux in terms of Kamnitzer's MV polytopes and the Kashiwara-Saito geometric construction of B(∞) when the underlying Lie algebra is of type Ar. ^
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