Self-gravitating baryonic tubes exist for arbitrary N in the SU(N) Einstein non-linear sigma model with omega mesons, with binding energy decreasing as N grows in the flat-space limit.
Weinberg, Phys
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Self-gravitating baryonic tubes supported by $\pi$- and $\omega$-mesons and its flat limit
Self-gravitating baryonic tubes exist for arbitrary N in the SU(N) Einstein non-linear sigma model with omega mesons, with binding energy decreasing as N grows in the flat-space limit.