Simplicial complexes lying equivariantly over the affine building of GL( N )

Author: Broussous Paul  

Publisher: Springer Publishing Company

ISSN: 0025-5831

Source: Mathematische Annalen, Vol.329, Iss.3, 2004-07, pp. : 495-511

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Abstract

Let G=GL(N,K), K a non-archimedean local field and X be the semisimple affine building of G over K. We construct a projective tower of G-sets with X(0)=X. They are obtained by using a minor modification in Bruhat and Tits’ original construction (an idea due to P. Schneider). Using the structure of X as an abstract building, we construct a projective tower of simplicial G-complexes such that, for each r, X (r) is canonically a geometrical realization of X r . In the case N=2, X r has a natural two-sheeted covering r and we show that the supercuspidal part of the cohomology space is characterized by a nice property.