Kazhdan constants for $\mathop{\rm {Sp}}\left( n,\Omega \right) $ where $\Omega $ is a
commutative topological ring with dense finitely generated subring with
unity are determined. This implies Kazhdan's property T for these groups. As
application explicit Kazhdan constants are determined for the loop groups
corresponding to $\mathop{\rm {Sp}}\left( n,\mathbf{C}\right) $. These are further
examples of groups with property T which are infinite dimensional Lie groups
and not locally compact.
@article{1070645800,
author = {Neuhauser, Markus},
title = {Kazhdan's Property T for the Symplectic Group over a Ring},
journal = {Bull. Belg. Math. Soc. Simon Stevin},
volume = {10},
number = {1},
year = {2003},
pages = { 537-550},
language = {en},
url = {http://dml.mathdoc.fr/item/1070645800}
}
Neuhauser, Markus. Kazhdan's Property T for the Symplectic Group over a Ring. Bull. Belg. Math. Soc. Simon Stevin, Tome 10 (2003) no. 1, pp. 537-550. http://gdmltest.u-ga.fr/item/1070645800/