Kerr Black hole mimickers sourced by a string fluid

Understand

We present rotating solutions of Einstein's gravity coupled to an effective Born-Infeld theory that describes the end of open-string tachyon condensation after the decay of an unstable $D$-brane or a brane-antibrane system.

• The geometry of these solutions is that of the rotating frozen star.
• The solutions are stationary, non-singular and ultracompact, and their exterior geometry is identical, for all practical purposes, to that of the Kerr solution.
• The Born-Infeld matter consists of radial electric-flux tubes that emanate from, or end at, the ellipsoidal core of the star.