Atsushi Nakamula, Shin Sasaki
We study doubly periodic BPS lumps in supersymmetric CP^{N-1} non-linear sigma models on a torus T^2. Following 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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http://arxiv.org/abs/1205.5940
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