A new bigravity model with exclusively positive branes

Details A new bigravity model with exclusively positive branes A new bigravity model with exclusively positive branes

2000-11-15

arxiv.org/abs/hep-th/0011141v3

Phys.Lett. B501 (2001) 140-149

Physics

High Energy Physics

High Energy Physics - Theory

17 pages, 1 axodraw figure, comments added in the introduction, references added, minor typos corrected

Scientific paper

10.1016/S0370-2693(01)00096-X

We propose a new ``bigravity'' model with two positive tension AdS_4 branes in AdS_5 bulk and no negative tension branes. The bounce of the ``warp'' factor mimics the effect of a negative brane and thus gives rise to an anomalously light graviton KK mode. This configuration satisfies the weak energy condition and has no ghost state. In addition, the extra polarization states of the massive graviton practically decouple and thus it does not contradict to Einsteinian gravity. However, the model has certain phenomenological difficulties associated with the presence of a negative cosmological constant on the branes.

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