We define a Fourier-Mukai transform for sheaves on K3 surfaces over $\C$, and show that it maps polystable bundles to polystable ones. The role of "dual" variety to the given K3 surface $X$ is here played by a suitable component $\whatx$ of the moduli space of stable sheaves on $X$. For a wide class of K3 surfaces $\whatx$ can be chosen to be isomorphic to $X$; then the Fourier-Mukai transform is invertible, and the image of a zero-degree stable bundle $F$ is stable and has the same Euler characteristic as $F$.
A Fourier-Mukai transform for stable bundles on K3 surfaces
BARTOCCI, CLAUDIO;
1997-01-01
Abstract
We define a Fourier-Mukai transform for sheaves on K3 surfaces over $\C$, and show that it maps polystable bundles to polystable ones. The role of "dual" variety to the given K3 surface $X$ is here played by a suitable component $\whatx$ of the moduli space of stable sheaves on $X$. For a wide class of K3 surfaces $\whatx$ can be chosen to be isomorphic to $X$; then the Fourier-Mukai transform is invertible, and the image of a zero-degree stable bundle $F$ is stable and has the same Euler characteristic as $F$.
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