Brane world gravity in an AdS black hole

Abstract

We consider a model of brane world gravity in the context of non-conformal non-SUSY matter. In particular, we modify the earlier strong coupling solution to the glueball spectrum in an AdS 7 black hole by introducing a Randall–Sundrum Planck brane as a UV cut-off. The consequence is a new normalizable zero mass tensor state, which gives rise to an effective Einstein–Hilbert theory of gravity, with exponentially small corrections set by the mass gap to the discrete glueball spectrum. However, the simplest microscopic theory for the Planck brane is found to have a tachyonic instability in the radion mode.