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We discuss the effects from the Kaluza-Klein modes in the brane worldscenario when an interaction between bulk and brane fields is included. Wefocus on the bulk inflaton model, where a bulk field $\Psi$ drives inflation inan almost $AdS_5$ bulk bounded by an inflating brane. We couple $\Psi$ to abrane scalar field $\phi$ representing matter on the brane. The bulk field$\Psi$ is assumed to have a light mode, whose mass depends on the expectationvalue of $\phi$. To estimate the effects from the KK modes, we compute the1-loop effective potential $V_\eff(\phi)$. With no tuning of the parameters ofthe model, the vacuum becomes (meta)stable -- $V_\eff(\phi)$ develops a truevacuum at a nonzero $\phi$. In the true vacuum, the light mode of $\Psi$becomes heavy, degenerates with the KK modes and decays. We comment on someimplications for the bulk inflaton model. Also, we clarify some aspects of therenormalization procedure in the thin wall approximation, and show that thefluctuations in the bulk and on the brane are closely related.Comment: 15 pages, 2 eps figures. Notation improved, references adde

Vacuum destabilization from Kaluza–Klein modes in an inflating brane