The local moduli space of charge-r/N self-dual instantons on a twisted T^4 is identified with the Higgs branch of a 4d N=2 theory on intersecting D5-branes, reproducing prior field-theory results with manifest hyper-Kähler structure.
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Numerical lattice study shows fractional instantons on twisted T^4 morph into monopole-instantons and center vortices as geometry interpolates between R^{4-k} x T^k, with some transitions discontinuous under deformation.
Classifies dyonic lattices consistent with SM gauge structure, re-derives θ periodicities, reduces physical θ-space to a 2-torus, and shows one axion is insufficient for full CP invariance.
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Metamorphosis of fractional instantons on a twisted $T^4$ with a double-trace deformation: a numerical study
Numerical lattice study shows fractional instantons on twisted T^4 morph into monopole-instantons and center vortices as geometry interpolates between R^{4-k} x T^k, with some transitions discontinuous under deformation.
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Dyonic lattices, $\theta$-angles and axions in the Standard Model
Classifies dyonic lattices consistent with SM gauge structure, re-derives θ periodicities, reduces physical θ-space to a 2-torus, and shows one axion is insufficient for full CP invariance.