Radion induced inflation on nonflat brane and modulus stabilization

Warped braneworld models have the potential to provide a plausible resolution to the gauge hierarchy problem but at the cost of introduction of an additional field, namely the interbrane separation or the radion field. Providing an appropriate stabilization scheme for the radion field has long been sought. In this work, we discuss dynamical stabilization of the radion field in the context of early universe cosmology. We show that, by allowing the branes to be nonflat and dynamical, a radion potential is naturally generated that can trigger the inflationary phase of the early universe. Interestingly, the kinetic term of the radion during the inflationary epoch exhibits a phantomlike behavior and the dynamical evolution of the radion field to its stable value marks the exit from the phantom phase as well as the inflationary era simultaneously. We show that the amalgamation and synergy of the radion potential along with its kinetic term can not only trigger the inflationary scenario but also provide a successful exit from the same while maintaining concordance with current observation.