PIRSA:17010057

Not quite a black hole

Ren, J. (2017). Not quite a black hole. Perimeter Institute. https://pirsa.org/17010057

Ren, Jing. Not quite a black hole. Perimeter Institute, Jan. 31, 2017, https://pirsa.org/17010057 

          @misc{ pirsa_PIRSA:17010057,
            doi = {10.48660/17010057},
            url = {https://pirsa.org/17010057},
            author = {Ren, Jing},
            keywords = {Cosmology},
            language = {en},
            title = {Not quite a black hole},
            publisher = {Perimeter Institute},
            year = {2017},
            month = {jan},
            note = {PIRSA:17010057 see, \url{https://pirsa.org}}
          }

Jing Ren University of Toronto

Talk numberPIRSA:17010057
DOI10.48660/17010057
Collection
Talk Type Scientific Series
Subject

Abstract

Astrophysical black hole candidates, although long thought to have a horizon, could be horizonless ultra-compact objects. This intriguing possibility is motivated by the black hole information paradox and a plausible fundamental connection with quantum gravity. In this talk I will consider the asymptotically free quadratic gravity as the UV completion of general relativity. Using a classical theory that captures its main features, we find that sufficiently dense matter produces a novel horizonless solution, the 2-2-hole. It closely matches the exterior Schwarzschild solution down to about a Planck proper length of the would-be horizon. I will describe interesting features of the 2-2-hole and various physical implications. As a generic static solution, the 2-2-hole may be the nearly black endpoint of gravitational collapse.