ETERNALLY INFLATING COSMOLOGIES FROM INTERSECTING SPACELIKE BRANES

Abstract

Intersecting spacelike braneworld cosmologies are investigated. The time axis is set on the scale parameter of extra space, which may include more than one timelike metric. We obtain the eternally inflating (i.e. undergoing late-time inflation) Robertson–Walker spacetime and extra space with a constant scale factor. In the case of multibrane solutions, some dimensions are static or shrink. The fact that the largest supersymmetry algebra contains 32 supercharges in four dimensions imposes a restriction on the geometry of extra space.