Sigma Model BPS Lumps on Torus

Atsushi Nakamula; Shin Sasaki

Sigma Model BPS Lumps on Torus

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arxiv 1205.5940 v2 pith:ZEWSGM7J submitted 2012-05-27 hep-th

Atsushi Nakamula , Shin Sasaki This is my paper

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keywords solutionsconstructionlumpsmodularsigmatorusarrangingbogomol

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We study doubly periodic Bogomol'nyi-Prasad-Sommerfield (BPS) lumps in supersymmetric CP^{N-1} non-linear sigma models on a torus T^2. Following the philosophy of the Harrington-Shepard construction of calorons in Yang-Mills theory, we obtain the n-lump solutions on compact spaces by suitably arranging the n-lumps on R^2 at equal intervals. We examine the modular invariance of the solutions and find that there are no modular invariant solutions for n=1,2 in this construction.

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Fractional instantons in 2d $\mathbb{C}P^{N-1}$ model and 4d Yang-Mills theory with 't Hooft twists
hep-th 2025-07 conditional novelty 7.0 of 10

Explicit theta-function solutions for fractional BPS lumps on a twisted torus are constructed, and the moduli space is a CP^(Nk+p-1) fiber bundle over a small torus, matching the index theorem.

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