Screening bulk curvature in the presence of large brane tension

2011/02/24 by Nishant Agarwal, Rachel Bean, Justin Khoury +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO #gr-qc #hep-th

paper · pdf · doi:10.1103/physrevd.83.124004

published as Phys.Rev.D83:124004,2011 · 21 pages, 2 figures

arxiv created 2011/02/24 · openalex publication_date 2011/06/01 · arxiv updated 2011/06/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We study a flat brane solution in an effective 5D action for cascading gravity in six dimensions, and propose a mechanism to screen extrinsic curvature in the presence of a large tension on the brane. The screening mechanism leaves the bulk Riemann-flat, thus making it simpler to generalize large extra-dimension dark energy models to higher codimensions. By studying an action with cubic interactions for the brane-bending scalar mode, we find that the perturbed action suffers from ghostlike instabilities for positive tension. The solution can be made ghost-free for sufficiently small negative tension, though the connection to 6D cascading gravity is less clear in this case.

Citations

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