Abstract
We consider the baby Skyrme model in a physically motivated limit of reaching the restricted or BPS baby Skyrme model, which is a model that enjoys area-preserving diffeomorphism invariance. The perturbation consists of the kinetic Dirichlet term with a small coefficient ϵ as well as the standard pion mass term, with coefficient \( \upepsilon {m}_1^2 \). The pions remain lighter than the soliton for any ϵ and therefore the model is physically acceptable, even in the ϵ → 0 limit. The version of the BPS baby Skyrme model we use has BPS solutions with Gaussian tails. We perform full numerical computations in the ϵ → 0 limit and even reach the strict ϵ = 0 case, finding new nontrivial BPS solutions, for which we do not yet know the analytic form.
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Gudnason, S.B., Barsanti, M. & Bolognesi, S. Near-BPS baby Skyrmions with Gaussian tails. J. High Energ. Phys. 2021, 134 (2021). https://doi.org/10.1007/JHEP05(2021)134
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DOI: https://doi.org/10.1007/JHEP05(2021)134