The Radion in the Karch-Randall Braneworld

Details The Radion in the Karch-Randall Braneworld The Radion in the Karch-Randall Braneworld

2003-11-24

arxiv.org/abs/hep-th/0311216v1

Nucl.Phys. B681 (2004) 120-136

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, Plain Tex

Scientific paper

10.1016/j.nuclphysb.2004.01.004

In a braneworld context, the radion is a massless mode coupling to the trace of the matter stress tensor. Since the radion also governs the separation between branes, it is expected to decouple from the physical spectrum in single brane scenarios, such as the one-brane Randall-Sundrum model. However, contrary to expectations, we demonstrate that the Karch-Randall radion always remains as a physical excitation, even in the single brane case. Here, the radion measures the distance not between branes, but rather between the brane and the anti-de Sitter boundary on the other side of the bulk.

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