1. Center for Astrophysics | Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
2. Department of Physics, Harvard University , 17 Oxford Street Cambridge, MA 02138, USA
3. John A. Paulson School of Engineering and Applied Sciences, Harvard University , 150 Western Ave, Allston, MA 02134, USA
4. Black Hole Initiative at Harvard University , 20 Garden Street, Cambridge, MA 02138, USA
5. School of Natural Sciences, Institute for Advanced Study , 1 Einstein Drive, Princeton, NJ 08540, USA
6. Princeton Gravity Initiative, Princeton University , Princeton, New Jersey 08544, USA
7. Princeton Center for Theoretical Science, Princeton University , Jadwin Hall, Princeton, NJ 08544, USA