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The rank stable topology of instantons on
Authors:Jim Bryan   Marc Sanders
Affiliation:Mathematical Sciences Research Institute, 1000 Centennial Drive, Berkeley, California 94720-5070 ; Department of Mathematics and Computer Science, Dickinson College, Carlisle, Pennsylvania 17013
Abstract:Let $% mathcal{M} _{k}^{n}$ be the moduli space of based (anti-self-dual) instantons on $% overline{mathbf {CP}}^2$ of charge $k$ and rank $n$. There is a natural inclusion $% mathcal{M} _{k}^{n}hookrightarrow % mathcal{M}_{k}^{n+1}$. We show that the direct limit space $% mathcal{M}_k^infty$ is homotopy equivalent to $BU(k)times BU(k)$. Let $% ell _{infty}$ be a line in the complex projective plane and let $% widetilde{% {mathbf C} % {mathbf{P}}}^{2}$ be the blow-up at a point away from $% ell _{infty}$. $% mathcal{M} _{k}^{n}$ can be alternatively described as the moduli space of rank $n$ holomorphic bundles on $% widetilde{% mathbf{C}% mathbf{P}}^{2}$ with $c_{1}=0$ and $c_{2}=k$ and with a fixed holomorphic trivialization on $% ell _{infty}$.

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