The BPS sectors of the Skyrme model and their non-BPS extensions

Abstract

Two recently found coupled BPS submodels of the Skyrme model are further analyzed. Firstly, we provide a geometrical formulation of the submodels in terms of the eigenvalues of the strain tensor. Secondly, we study their thermodynamical properties and show that the mean-field equations of state coincide at high pressure and read $p=\bar{\rho }/3$. We also provide evidence that matter described by the first BPS submodel has some similarity with a Bose-Einstein condensate. Moreover, we show that extending the second submodel to a non-BPS model by including certain additional terms of the full Skyrme model does not spoil the respective ansatz, leading to an ordinary differential equation for the profile of the Skymion, for any value of the topological charge. This allows for an almost analytical description of the properties of Skyrmions in this model. In particular, we analytically study the breaking and restoration of the BPS property. Finally, we provide an explanation of the success of the rational map ansatz.

LaTex file, 27 pages, 5 figures. v2: An error in Section V (old version) corrected, paper slightly reorganised, main conclusions unchanged. v3: version accepted for publication in PRD, minor changes

References in corpus (18)

• Skyrmions, instantons and holography
• A BPS Skyrme model and baryons at large Nc
• Spin-Charge Separation, Conformal Covariance and the SU(2) Yang-Mills Theory
• Skyrmions with massive pions
• A dynamical $\alpha$-cluster model of ${}^{16}$O
• BPS Skyrmions as neutron stars
• Exact multi-soliton solutions in the four dimensional Skyrme model
• Compact oscillons in the signum-Gordon model
• A point particle model of lightly bound skyrmions
• Generalized Skyrme model with the loosely bound potential
• Exact self-duality in a modified Skyrme model
• Scattering of Skyrmions
• Baryon chemical potential and in-medium properties of BPS skyrmions
• BPS submodels of the Skyrme model
• Generalized Skyrmions and hairy black holes in asymptotically AdS${}_4$ spacetime
• Crystal structures in generalized Skyrme model
• Perturbations of the signum-Gordon model
• The volume of a vortex and the Bradlow bound

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