Journal
PHYSICAL REVIEW D
Volume 94, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.94.096013
Keywords
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Funding
- Ministry of Education, Culture, and Sports, Spain [FPA 2014-58-293-C2-1-P]
- Xunta de Galicia [INCITE09.296.035PR]
- Spanish Consolider-Ingenio Programme CPAN [CSD2007-00042]
- Fondo Europeo de Desarrollo Regional (FEDER)
- MEXT-Supported Program for the Strategic Research Foundation at Private Universities Topological Science [S1511006]
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We study radial vibrations of spherically symmetric Skyrmions in the Bogomol'nyi-Prasad-Sommerfield Skyrme model. Concretely, we numerically solve the linearized field equations for small fluctuations in a Skyrmion background, both for linearly stable oscillations and for (unstable) resonances. This is complemented by numerical solutions of the full nonlinear system, which confirm all the results of the linear analysis. In all cases, the resulting fundamental excitation provides a rather accurate value for the Roper resonance, supporting the hypothesis that the Bogomol'nyi-Prasad-Sommerfield Skyrme model already gives a reasonable approximate description of this resonance. Furthermore, for many potentials additional higher resonances appear, again in agreement with known experimental results.
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