Cosmic inflation from fluctuating baby-Skyrme brane

• Published in: Annals of physics 2024-10, Vol.469, p.169766, Article 169766
• Main Authors: Fadhilla, Emir S., Gunara, Bobby E., Suroso, Agus, Atmaja, Ardian N.
• Format: Article
• Language: English
• Subjects: Braneworld; Cosmology; Inflation; Skyrmion
• ISSN: 0003-4916
• DOI: 10.1016/j.aop.2024.169766

In this work, we explore the inflationary dynamics induced by small fluctuations on the Skyrme brane, characterized by a time-dependent perturbative function ϕ̃. In the low-energy regime, the model successfully reproduces standard inflation, with a potential term dictated by the Skyrmion at the brane. Gravity localization is achieved at the brane, and the lowest energy scale is established at the asymptotic boundary. The model demonstrates the capability to emulate standard inflation dynamics, resembling ϕ̃4 potential characteristics under certain conditions. At higher energy regions, the behaviour of ϕ̃ is contingent upon the Skyrme term coupling constant λ, influencing reheating phases. The wave-like nature of fluctuations allows for energy transfer, resulting in a possibly lower reheating temperature. We also discuss the prospect of λ changing sign during inflation, presenting a non-standard coupling dependent on the matter field. •It is found that introducing small time-dependent fluctuation around static Skyrme brane solution reproduces the standard inflation model at a low energy regime.•At the higher energy regime, there are some corrections terms in the dynamical equations which alter the dynamics of the field.•If the fluctuation is assumed to have wave-like solutions, the correction terms can either speed up or slow down the decay of the field.•The speed-up decay of the field implies a correction to the reheating temperature.