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Published online by Cambridge University Press: 31 May 2017
Let $M$ be an irreducible holomorphic symplectic (hyperkähler) manifold. If
$b_{2}(M)\geqslant 5$, we construct a deformation
$M^{\prime }$ of
$M$ which admits a symplectic automorphism of infinite order. This automorphism is hyperbolic, that is, its action on the space of real
$(1,1)$-classes is hyperbolic. If
$b_{2}(M)\geqslant 14$, similarly, we construct a deformation which admits a parabolic automorphism (and many other automorphisms as well).