BPS states, string duality, and nodal curves on K3

Shing-Tung Yau Eric Zaslow

Mathematical Physics mathscidoc:1912.43490

Nuclear Physics B, 471, (3), 503-512, 1996.7
We describe the counting of BPS states of Type II on K3 by relating the supersymmetric cycles of genus <i>g</i> to the number of rational curves with <i>g</i> double points on K3. The generating function for the number of such curves is the left-moving partition function of the bosonic string.
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  title={BPS states, string duality, and nodal curves on K3},
  author={Shing-Tung Yau, and Eric Zaslow},
  booktitle={Nuclear Physics B},
Shing-Tung Yau, and Eric Zaslow. BPS states, string duality, and nodal curves on K3. 1996. Vol. 471. In Nuclear Physics B. pp.503-512. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224203555679897054.
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