scholarly journals Alcove walks and nearby cycles on affine flag manifolds

2007 ◽  
Vol 26 (4) ◽  
pp. 415-430 ◽  
Author(s):  
Ulrich Görtz
2006 ◽  
Vol 120 (4) ◽  
pp. 347-358 ◽  
Author(s):  
Ulrich Görtz ◽  
Thomas J. Haines

1988 ◽  
Vol 62 (2) ◽  
pp. 129-168 ◽  
Author(s):  
D. Kazhdan ◽  
G. Lusztig

There has been recently substantial progress in the programme of expressing the characters of irreducible modular representations of a semisimple group over a field of positive characteristic in terms of combinatorics of affine Hecke algebras (see Andersen et al . 1992; Kazhdan & Lusztig 1979). This paper is a further contribution to this programme: I explain why in the non-simply laced case, the ‘dual’ affine Weyl group is needed and why in this case it is necessary to use monodromic systems (certain local systems defined on subvarieties of a line bundle) over an affine flag manifold.


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Proc. R. Soc. Lond. A 445, 231-246 (1994) Monodromic systems on affine flag manifolds By George Lusztig Section 8 contains a blunder; I am indebted to Alexander Kirillov Jr for pointing this out to me. In the second sentence of 8.2 on p. 244, replace ς=exp(π√-1/ (σ + g )) by ς = exp(π√-1/ D (σ + g )). The subsequent sentences of 8.2 and all of 8.3 should be deleted. Replace the text of 8.4 on p. 245, starting with the second sentence, by the following text.


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