New horizons for black holes and branes

  • Roberto Emparan
  • Troels Harmark
  • Vasilis Niarchos
  • Niels A. Obers
Open Access


We initiate a systematic scan of the landscape of black holes in any spacetime dimension using the recently proposed blackfold effective worldvolume theory. We focus primarily on asymptotically flat stationary vacuum solutions, where we uncover large classes of new black holes. These include helical black strings and black rings, black odd-spheres, for which the horizon is a product of a large and a small sphere, and non-uniform black cylinders. More exotic possibilities are also outlined. The blackfold description recovers correctly the ultraspinning Myers-Perry black holes as ellipsoidal even-ball configurations where the velocity field approaches the speed of light at the boundary of the ball. Helical black ring solutions provide the first instance of asymptotically flat black holes in more than four dimensions with a single spatial U(1) isometry. They also imply infinite rational non-uniqueness in ultraspinning regimes, where they maximize the entropy among all stationary single-horizon solutions. Moreover, static blackfolds are possible with the geometry of minimal surfaces. The absence of compact embedded minimal surfaces in Euclidean space is consistent with the uniqueness theorem of static black holes.


p-branes Classical Theories of Gravity Black Holes 


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Copyright information

© The Author(s) 2010

Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • Roberto Emparan
    • 1
    • 2
  • Troels Harmark
    • 3
  • Vasilis Niarchos
    • 4
    • 5
  • Niels A. Obers
    • 6
  1. 1.Institució Catalana de Recerca i Estudis Avançats (ICREA)BarcelonaSpain
  2. 2.Departament de Física Fonamental and Institut de Ciències del CosmosUniversitat de BarcelonaBarcelonaSpain
  3. 3.NORDITAStockholmSweden
  4. 4.Centre de Physique ThéoriqueÉcole PolytechniquePalaiseauFrance
  5. 5.Unité mixte de Recherche 7644, CNRSParisFrance
  6. 6.The Niels Bohr InstituteCopenhagen ØDenmark

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