Black-Hole Uniqueness and Hair  

Various Kinds of Hair
@ Scalar hair: Bekenstein PRD(72), PRD(72); Christodoulou CMP(87); Ferrari & Xanthopoulos PRD(90); Bekenstein PRD(95); Mavromatos gq/96-in [in Einstein-Yang-Mills and Einstein-Gauss-Bonnet]; Saa JMP(96)gq, PRD(96)gq [no-hair theorems]; Ortín ht/97-in; Sen & Banerjee Pra(01)gq/98; Rogatko PRD(99)ht [dilaton]; Banerjee et al MPLA(01); Degura et al G&C(01) [2+1]; Nucamendi & Salgado PRD(03)gq; Hertog PRD(06)gq.
@ Scalar hair, with cosmological constant: Torii et al PRD(99)gq/98, PRD(01) [aAdS]; Winstanley FP(03)gq/02; Sudarsky & González PRD(03) [aAdS]; Martínez & Troncoso PRD(06) [charged]; Buchel & Pagnutti a0904.
@ Axionic hair: Bowick et al PRL(88); > s.a. axions.
@ Abelian Higgs hair: Achúcarro et al PRD(95)gq [Nielsen-Olesen string]; Chamblin et al PRL(98), PRD(98) [extreme]; Ghezelbash & Mann PRD(02) [rotating and charged black holes].
@ With Skyrme hair: Droz et al PLB(91); Moss et al CQG(00)gq; Tamaki et al PRD(01)gq.
@ Yang-Mills hair: Bizón PRL(90), Straumann & Zhou PLB(90) [SU(2) Einstein-Yang-Mills]; Mavromatos & Winstanley JMP(98); Kleihaus et al gq/98-in; Ashtekar et al CQG(01)gq/00 [as bound states with colored solitons]; Kleihaus & Kunz PRL(01) [SU(2) Einstein-Yang-Mills, rotating]; Weinberg gq/01-ln.
@ Quantum hair: Krauss GRG(90); Preskill & Krauss NPB(90); Coleman et al PRL(91), GRG(92), NPB(92); Krauss & Liu NPB(97)ht/96 [effects]; Dabholkar & Trivedi JHEP(99) [discrete, in AdS]; Dvali PRD(06)ht [massive spin-2], ht/06 [long-range super-massive tensor fields].
@ Short hair: Núñez et al PRL(96)gq/95; Brown & Husain IJMPD(97)gq.
@ Other kinds: Strominger PRL(96)ht [statistical, from string theory]; Krauss et al PRL(96)ht [hairy, dirty black holes]; Larsen & Wilczek NPB(96)ht, NPB(97)ht/96 [from string theory]; Bronnikov & Zaslavskii PRD(08)-a0801 ["curly hair"].

No-Hair and Uniqueness Results > s.a. black-hole perturbations; kerr spacetime.
* Idea: The expression "black holes have no hair," introduced by Wheeler, means that a stationary black hole is characterized just by the value of those multipoles that cannot be radiated away; There are no bifurcations from the Kerr-Newman family of solutions; In particular, uniqueness theorems prove that there are no other families of solutions with the same parameters; These are global results, and are shown using Green-like identities and integrals.
* Results: 1984, Established first for electrovac solutions; They hold also in scalar-tensor theories and supergravity; There are no static, spherically symmetric Einstein-Dirac-Maxwell or Einstein-Yang-Mills-Dirac solutions with non-trivial spinors.
* Exceptions: Scalar hair in Einstein-Yang-Mills-Higgs systems (but unstable), and higher-curvature (Gauss-Bonnet, string inspired) gravity (but no new conserved quantum number).
@ Tests: Will ApJL(08)-a0711 [with orbits of stars around SgrA*].

References > s.a. black holes [topology].
@ Books, reviews: Chrusciel CM(94)gq; Bekenstein gq/96-in; Heusler HPA(96)gq, 96, LRR(98); Carter gq/97-MG8; Mazur ht/01-in.
@ Vacuum: Israel PR(67); Carter PRL(71), in(73); Hawking CMP(72); in Hawking & Ellis 73; Robinson PRL(75); Mazur JPA(82), GRG(84); Bergqvist & Ludvigsen GRG(89), Mars CQG(00)gq [Kerr]; Ionescu & Klainerman a0711; Chrusciel & Lopes Costa a0806 [Kerr].
@ Einstein-Maxwell: Israel CMP(68); Robinson PRD(74); Mazur APPB(83); Ruback CQG(88); Chrusciel HPA(96)gq; Amsel et al a0906 [extremal Kerr and Kerr-Newman, closing the gap in the uniqueness proof].
@ Einstein-Maxwell +: Finster et al CMP(99)gq/98 [+ Dirac, no-black-hole result]; Torii et al PRD(01) [+ scalar, in Anti-de Sitter]; Mars & Simon ATMP(02)gq/01 [+ dilaton].
@ Einstein-Yang-Mills +: Finster et al MMJ(00)gq/99 [+ Dirac, no-black-hole result].
@ Other theories: Ayón-Beato et al PRD(00)gq/99 [metric-affine]; Ayón-Beato in(02)gq [Proca field].
@ Higher-dimensional: Mazur & Bombelli JMP(87) [5D Kaluza-Klein]; Gibbons et al PRL(02)gq; Kol ht/02; Reall PRD(03) [supersymmetric, 5D]; Rogatko PRD(03)ht, PRD(04) [5D sigma-models, stationary], PRD(06); Hollands et al CMP(07)gq/06 [stationary rotating implies axisymmetric]; Hollands & Jazadjiev CQG(08) [5D Einstein-Maxwell]; Hollands & Yazadjiev a0812 [D-dimensional Kaluza-Klein]; Figueras & Lucietti a0906.
@ Supersymmetric: Gutowski JHEP(04)ht; Tomizawa et al PRD(09)-a0901 [5D minimal supergravity].
@ Generalized no-hair / uniqueness theorems: Etesi CMP(98)ht/97; Wells gq/98 [accelerating black holes], gq/98 [superstring black holes]; Bhattacharya & Lahiri PRL(07)gq [positive cosmological constant].
@ Hairy situations: Dubovsky et al JHEP(07)-a0706 [Lorentz-violating theories of massive gravity].


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