A higher-order Skyrme model

Sven Bjarke Gudnason, Muneto Nitta

研究成果: Article

5 引用 (Scopus)

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We propose a higher-order Skyrme model with derivative terms of eighth, tenth and twelfth order. Our construction yields simple and easy-to-interpret higher-order Lagrangians. We first show that a Skyrmion with higher-order terms proposed by Marleau has an instability in the form of a baby-Skyrmion string, while the static energies of our construction are positive definite, implying stability against time-independent perturbations. However., we also find that the Hamiltonians of our construction possess two kinds of dynamical instabilities, which may indicate the instability with respect to time-dependent perturbations. Different from the well-known Ostrogradsky instability, the instabilities that we find are intrinsically of nonlinear nature and also due to the fact that even powers of the inverse metric gives a ghost-like higher-order kinetic-like term. The vacuum state is, however, stable. Finally., we show that at sufficiently low energies, our Hamiltonians in the simplest cases, are stable against time-dependent perturbations.

元の言語English
記事番号28
ジャーナルJournal of High Energy Physics
2017
発行部数9
DOI
出版物ステータスPublished - 2017 9 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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