Bubbles of nothing in binary black holes and black rings, and viceversa

A bstract We argue that expanding bubbles of nothing are a widespread feature systems black holes with multiple or non-spherical horizons, appearing as limit regions narrowly enclosed by the horizons. The bubble is minimal cycle links Einstein-Rosen bridges in system, and its expansion occurs through familiar stretching space hole interiors. demonstrate this idea (which does not involve any Wick rotations) explicit constructions four five dimensions. geometries these dimensions arise of, respectively, static binaries rings. such separation between two holes, inner ring, becomes very small, horizons correspond to acceleration bubbles. also explain how five-dimensional binary gives rise different type bubble. then show spacetimes can host rings equilibrium, their gravitational attraction being balanced against background spacetime expansion. Similar expected six more dimensions, but most solutions be obtained only numerically. Finally, we Nariai solution regarded containing an circular nothing.