Renormalization group improvement of the effective potential in six dimensions

Abstract

Using the renormalization group improvement technique, we study the effective potential of a model consisting of $N$ scalar fields ${\varphi }^i$ transforming in the fundamental representation of $O(N)$ group coupled to an additional scalar field $\sigma$ via cubic interactions, defined in a six-dimensional spacetime. We find that the model presents a metastable vacuum, that can be long-lived, where the particles become massive. The existence of attractive and repulsive interactions plays a crucial role in such phenomena.

arXiv comment15 pages, 2 figures. References updated. Appendix added. Version accepted for publication in PRD

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• Solitons and instantons in vacuum stability: physical phenomena
• Improved effective potential of Gildener-Weinberg models