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Self-duality and the holomorphic ansatz in a generalized BPS Skyrme model
Phys. Rev. D 112, 125019 – Published 16 December, 2025
DOI: https://doi.org/10.1103/dmdd-xc1l
Abstract
We propose a generalization of the Bogomol’ny–Prasad–Sommerfield Skyrme model [L. A. Ferreira, Exact self-duality in a modified Skyrme model, J. High Energy Phys. 07 (2017) 039] for simple compact Lie groups that leads to Hermitian symmetric spaces. In such a theory, the Skyrme field takes its values in , while the remaining fields correspond to the entries of a symmetric, positive, and invertible -dimensional matrix . We also use the holomorphic map Ansatz between proposed in Ferreira and Livramento [Harmonic, holomorphic and rational maps from self-duality, arXiv:2412.02636] to study the self-dual sector of the theory, which generalizes the holomorphic Ansatz between proposed in Ioannidou [Low-energy states in the SU(N) Skyrme models, in International Meeting on Mathematical Methods in Modern Theoretical Physics (ISPM 98) (1998), pp. 91–123, arXiv:hep-th/9811071]. This Ansatz is constructed using the fact that stable harmonic maps of the two spheres for compact Hermitian symmetric spaces are holomorphic or antiholomorphic [J. Eells and L. Lemaire, Two Reports on Harmonic Maps (World Scientific Publishing Company, Singapore, 1995)]. Apart from some special cases, the self-duality equations do not fix the matrix entirely in terms of the Skyrme field, which is completely free, as it happens in the original self-dual Skyrme model for . In general, the freedom of the fields tend to grow with the dimension of . The holomorphic Ansatz enable us to construct an infinite number of exact self-dual Skyrmions for each integer value of the topological charge and for each value of , in case of the , and for each values of , in case of .
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