Effective Lagrangian and stability analysis in warped space

• Published in: The journal of high energy physics 2022-09, Vol.2022 (9), p.195-20, Article 195
• Main Author: Cai, Haiying
• Format: Article
• Language: English
• Subjects: Branes; Classical and Quantum Gravitation; Cosmology; Decoupling; Degrees of freedom; Effective Field Theories; Einstein equations; Elementary Particles; Equations of motion; Extra Dimensions; Field Theories in Higher Dimensions; Gravitons; High energy physics; Mathematical analysis; Perturbation; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Theoretical Physics; Relativity Theory; Stability analysis; String Theory; Symmetry
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP09(2022)195

A bstract In the warped space model, the inter-brane distance can be stabilized by the Goldberger-Wise mechanism. Of particular importance, the stabilization potential calls for a proper identification of the dynamical degree of freedom. In this paper, we provided a complete calculation of the effective Lagrangian till the quadratic order that is generic for the Randall-Sundrum model and its N -brane ( N ≥ 4) extensions. By applying the variation principle to a specific perturbation field, we derived the equations of motion and orthogonal conditions for decoupling the graviton. This approach is demonstrated to be equivalent to the analysis using the linearized Einstein equation. Our derivation clarifies that in the N -brane set up, just one degree of freedom for the radion field is dynamical, with the other modes eliminated by the gauge fixings. Thus we can directly generalize the GW stabilization to the N -brane model in a way similar to the RS1 scenario.