Existence conjecture for monopoles with prescribed magnetic and holomorphic charges

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Fix a nonzero mass μ∈g\mu\in\mathfrak g. Choose a maximal torus and the associated simple roots so that the charges are divided into nonnegative magnetic charges (m1,…,ms)(m_1,\ldots,m_s) and holomorphic charges (h1,…,hr−s)(h_1,\ldots,h_{r-s}). The holomorphic charges are required to satisfy

∑l=1r−s2⟨αi,αl+s⟩⟨αl+s,αl+s⟩hl+∑j=1s2⟨αi,αj⟩⟨αj,αj⟩mj≤0,i=s+1,…,r.\sum_{l=1}^{r-s} \frac{2\langle\alpha_i,\alpha_{l+s}\rangle}{\langle\alpha_{l+s},\alpha_{l+s}\rangle}h_l+\sum_{j=1}^s\frac{2\langle\alpha_i,\alpha_j\rangle}{\langle\alpha_j,\alpha_j\rangle}m_j\le 0, \qquad i=s+1,\ldots,r.

Charge-existence conjecture. For a given μ\mu there are monopoles with any collection of nonnegative magnetic charges (m1,…,ms)(m_1,\ldots,m_s). Given a choice of magnetic charges, there are monopoles with any collection of holomorphic charges (h1,…,hr−s)(h_1,\ldots,h_{r-s}) satisfying the displayed constraint. This predicts existence in every charge sector allowed by the root-theoretic inequalities, extending beyond the cases where existence was known.

References

Primary source

Michael K. Murray and Michael A. Singer, “A note on monopole moduli spaces”, arXiv:math-ph/0302020 (2003).

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