In arXiv:1705.10172 it was proposed that string theory replaces Schwarzschildblack holes with horizonless thin shells with an AdS interior. In this paper weextend the analysis to slowly rotating black holes, solving theIsrael-Lanczos-Sen junction conditions for a rotating shell composed of stringymatter to determine the metric. Outside of the shell we find a vacuum solutionthat differs from Kerr with a 32% larger quadrupole moment. We discuss theobservational consequences and explore the possibility to distinguish between ablack shell and a black hole. Promising methods include imaging of the blackhole at the center of the Milky Way using the Event Horizon Telescope,precision measurements of stars in close orbits around the central black hole,and future observations of colliding super massive black holes using the spacebased gravitational wave observatory LISA.
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