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extremal black hole

Contents

Contents

Idea

For a charged and/or rotating black hole (Kerr spacetime, Reissner-Nordstrom spacetime, Kerr-Newman spacetime) there is a minimum possible mass for given charge and angular momentum. When this minimum is attained, one hence speaks of an extremal black hole.

Properties

Near horizon geometry and JT gravity

The near horizon geometry of extremal black holes in dd dimensional spacetime is anti de Sitter spacetime AdS 2AdS_{2} (KLR 07, AGJST 06, AY 07, ANT 07).

The AdS 2×S d2AdS_2 \times S^{d-2} near horizon geometry of near-extremal black holes is well approximated by Jackiw-Teitelboim gravity (NSST 18, MTV 18).

References

General

  • Tatsuo Azeyanagi, Tatsuma Nishioka, Tadashi Takayanagi, Near Extremal Black Hole Entropy as Entanglement Entropy via AdS 2/CFT 1AdS_2/CFT_1, Phys.Rev.D77:064005,2008 (arXiv:0710.2956)

  • Sean Carroll, Matthew C. Johnson, Lisa Randall?, Extremal limits and black hole entropy, JHEP 0911:109,2009 (arXiv:0901.0931)

  • Ashoke Sen, Extremal black holes, talk slides 2009 (pdf)

See also

Near-horizon geometry and JT gravity

Discussion of the near horizon geometry

  • Hari K. Kunduri, James Lucietti, Harvey S. Reall, Near-horizon symmetries of extremal black holes, Class.Quant.Grav.24:4169-4190,2007 (arXiv:0705.4214)

  • Dumitru Astefanesei, Kevin Goldstein, Rudra P. Jena, Ashoke Sen, Sandip P. Trivedi, Rotating Attractors, JHEP 0610:058,2006 (arXiv:hep-th/0606244)

  • Dumitru Astefanesei, Hossein Yavartanoo, Stationary black holes and attractor mechanism, Nucl.Phys.B794:13-27,2008 (arXiv:0706.1847)

via JT gravity:

  • Pranjal Nayak, Ashish Shukla, Ronak M Soni, Sandip P. Trivedi, V. Vishal, On the Dynamics of Near-Extremal Black Holes (arXiv:1802.09547)

  • Upamanyu Moitra, Sandip P. Trivedi, V. Vishal, Near-Extremal Near-Horizons (arXiv:1808.08239)

Observational signature

  • Minyong Guo, Niels A. Obers, Haopeng Yan, Observational signature of near-extremal Kerr-like black holes in a modified gravity theory at the Event Horizon Telescope, Phys. Rev. D 98, 084063 (2018) (arXiv:1806.05249)

Actual observation

Near-extremal spinnin black holes are being observed

Last revised on July 10, 2019 at 10:06:59. See the history of this page for a list of all contributions to it.