Abstract :
[en] The main theorem is a classification of smooth actions of
$\SL(n,\BR)$, $n \geq 3$, or connected groups locally isomorphic to it,
on closed $n$-manifolds, extending a theorem of Uchida
\cite{uchida.slnr.sn}. We also construct new exotic actions of
$\SL(n,\BZ)$ on the $n$-torus and connected sums of $n$-tori, and we
formulate a conjectural classification of actions of lattices in
$\SL(n,\BR)$ on closed $n$-manifolds. We prove some related results about
invariant rigid geometric structures for $\SL(n,\BR)$-actions.
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