UMD-PP-10-001 Scalar Kinks in Warped Extra Dimensions Manuel Toharia a $^{∗}$, Mark Trodden b $^{†}$, and Eric J. West b,c ‡ a Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, MD 20742, USA b Center for Particle Cosmology, Department of Physics and Astronomy, University of Pennsylvania, Philadelphia PA 19104, USA Abstract We study the existence and stability of static kink-like configurations of a 5D scalar field, with Dirichlet boundary conditions, along the extra dimension of a warped braneworld. In the presence of gravity such configurations fail to stabilize the size of the extra dimension, leading us to consider additional scalar fields with the role of stabilization. We numerically identify multiple nontrivial solutions for a given 5D action, made possible by the nonlinear nature of the background equations, which we find is enhanced in the presence of gravity. Finally, we take a first step towards addressing the question of the stability of such configurations by deriving the full perturbative equations for the gravitationally coupled multi-field system. PACS numbers: ∗ mtoharia@umd.edu † trodden@physics.upenn.edu ‡ ejwest@physics.syr.edu arXiv:1002.0011v1 [hep-ph] 1 Feb 2010 1 c Department of Physics, Syracuse University, Syracuse NY 13244, USA (Dated: May 13, 2018)