Abstract
Approximate analytical solutions describing the skyrmions given by rational-map ansatz are obtained. At large baryon numbers, these solutions are similar to the domain wall or to spherical bubbles with energy and baryon number density concentrated at their boundary. A rigorous upper bound is obtained for the masses of rational map multiskyrmions, which is close to known masses, especially at large B. The main properties of bubbles of matter are obtained for an arbitrary number of flavors.
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