Thick brane in Rastall gravity

Understand

In this work, thick branes in Rastall gravity are investigated.

• Three types of maximally symmetric thick brane models are constructed and the linear tensor perturbation is analyzed.
• In the flat brane model, the tensor modes of the perturbation are either unstable or nonlocalizable for a nonvanishing Rastall parameter.
• In the de Sitter brane model, only the ground state of the tensor mode is localized.