We present a construction employing a type IIA supergravity and 3-form flux background together with an NS5-brane that localises massless gravity near the 5-brane worldvolume. The nonsingular underlying type IIA solution is a lift to 10D of the vacuum solution of the 6D Salam-Sezgin model and has a hyperbolicH(2,2)×S1 structure in the lifting dimensions. A fully back-reacted solution including ...

Brane observers executing appropriate motion through a partially compactified Lorentz invariant bulk spacetime, such as ${M}_{4}\ifmmode\times\else\texttimes\fi{}{S}^{1}$, can send signals along the brane that are instantaneous or even travel backward in time. Nevertheless, causality braneworld remains intact. We establish these results, which follow from superluminal signal propagation reporte...

We recently studied the formation and evaporation of primordial black holes in a simple braneworld cosmology, namely the Randall-Sundrum type II cosmology. Here we study the effect of accretion from the cosmological background onto the black holes after formation. While it is generally believed that in the standard cosmology such accretion is of negligible importance, we find that during the hi...