Francisco Navarro-Lérida 1, Jutta Kunz 1, Dieter Maison 2, Jan Viebahn 1 MG11 Meeting, Berlin...
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Transcript of Francisco Navarro-Lérida 1, Jutta Kunz 1, Dieter Maison 2, Jan Viebahn 1 MG11 Meeting, Berlin...
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Francisco Navarro-Lérida1, Jutta Kunz1, Dieter Maison2, Jan Viebahn1
MG11 Meeting, Berlin 25.7.2006
Charged Rotating Black Holes in Higher DimensionsCharged Rotating Black Holes in Higher Dimensions
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Outline
• Introduction
• Einstein-Maxwell Black Holes
• Einstein-Maxwell-Dilaton Black Holes
• Einstein-Maxwell-Chern-Simons Black Holes
• Conclusions
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• 4D Einstein-Maxwell (EM) black holes
• D>4 Einstein-Maxwell black holes
Introduction
Static Rotating
Uncharged Schwarzschild (M) Kerr (M, J)
ChargedReissner-Nordström
(M, Q, P)
Kerr-Newman
(M, J, Q, P)
Static Rotating
Uncharged Tangherlini (M) Myers-Perry (M, Ji)
Charged Tangherlini (M, Q) ?
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• Aim: Higher dimensional Abelian black holes asymptotically flat and with regular horizon
• Black rings are allowed for D>4 Emparan&Reall 2002
• D>4 EM +
Introduction
nothing (pure EM theory)
dilaton (EMD theory)
Chern-Simons term
(EMCS theory; just for odd D)
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Einstein-Maxwell action
• Maxwell field strength tensor Einstein equations
with stress-energy tensor
Maxwell equations
Einstein-Maxwell Black Holes
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• General black holes: characterized by mass M N=[(D-1)/2] angular momenta Ji and charge Q(no magnetic charge for D>4)
• No analytical charged rotating solutions for D>4
• Numerical approach: too complicated in the general case
• Restricted case: odd dimensional black holes with equal-magnitude angular momenta
• Simplification=field equations reduce to a system of 5 ODE’s Kunz, Navarro-Lérida, Viebahn 2006
• Similar procedure for EMD and EMCS theories
Einstein-Maxwell Black Holes
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• Ansätze (D=2N+1)
Einstein-Maxwell Black Holes (odd D)
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• Regular horizon at r=rH with f(rH)=0
• Killing vector null at the horizon=horizon angular velocity
• Removing a0 : first integral
• Mass formula Gauntlett, Myers, Townsend 1999
Einstein-Maxwell Black Holes (odd D)
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Einstein-Maxwell Black Holes (odd D)
Domain of existence
(scaled quantities)
Mass Angular momentum
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• Gyromagnetic ratio
• g=2 for D=4 but ...
• Perturbative value g=(D-2) Aliev 2006
Einstein-Maxwell Black Holes (odd D)
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Einstein-Maxwell-Dilaton action
(units 16 GD=1) h=dilaton coupling constant
Field equations
• Analytical solutions!!! Kaluza-Klein black holesKunz, Maison, Navarro-Lérida, Viebahn 2006
Einstein-Maxwell-Dilaton Black Holes
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• Myers-Perry solution as seed • Fixed dilaton coupling constant
Einstein-Maxwell-Dilaton Black Holes (Kaluza-Klein)
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• Some quantities
• Horizon:• Surface gravity:
• Domains of existance: Extremal solutions sg=0
• Scaled quantities:
Einstein-Maxwell-Dilaton Black Holes (Kaluza-Klein)
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Einstein-Maxwell-Dilaton Black Holes (Kaluza-Klein)
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Einstein-Maxwell-Dilaton Black Holes (Kaluza-Klein)
• Similar pattern for D>6
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• Restricted case: odd D, equal-magnitude angular momenta• Same ansatz as in EM theory + =(r)• No constraint on the dilaton coupling constant
Einstein-Maxwell-Dilaton Black Holes (odd D) Einstein-Maxwell-Dilaton Black Holes (odd D)
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• Just for odd D(=2N+1): Chern-Simons term AFN
Einstein-Maxwell-Chern-Simons action
Einstein equations
Maxwell equations
Kunz, Navarro-Lérida 2006
Einstein-Maxwell-Chern-Simons Black Holes
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• Black hole solutions: regular horizon r=rH
• Restricted case: same ansatz as for EM black holes• First integral of the system of ODE’s
• Mass formula
• Scaling
Einstein-Maxwell-Chern-Simons Black Holes
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• Redefinition: • Cases:
• Analytical solutions: only for =1Breckenridge, Myers, Peet, Vafa 1997
• Good for testing the numerical scheme(restricted case: |J1|=|J2|)
• Very high accuracy!!!
Einstein-Maxwell-Chern-Simons Black Holes (D=5)
0: Einstein-Maxwell theory
1: bosonic sector of minimal D=5 supergravity
1
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• Domain of existence(extremal solutions)
Extremal =1 EMCS
(supersymmetric branch)
• Mass saturates
• Angular momentum satisfies
• Vanishing horizon angular velocity
Einstein-Maxwell-Chern-Simons Black Holes (D=5)
• Instability beyond =1 (up to =2) supersymmetry marks a borderline between stability and instability
• =2 is a special case infinite set of extremal black holes with the same charges?
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Einstein-Maxwell-Chern-Simons Black Holes (D=5)
Four types of black holes
• Type I: Corrotating J ¸ 0 and =0 , J=0
• Type II: Static horizon =0 but non-vanishing J 0 ( ¸ 1 and =1 ) extremal)
• Type III: Counterrotating J < 0 ( > 1)
• Type IV: Rotating horizon 0 but J=0 ( ¸ 2 and =2 ) extremal)
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Einstein-Maxwell-Chern-Simons Black Holes (D=5)
The horizon mass may be negative !!!
Black holes are not uniquely determined by M, Ji, Q (non-uniqueness even for horizons of spherical topology)
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• Abelian higher dimensional charged rotating BH’s
• Restricted case: odd D + equal-magnitude angular momenta ) system of ODE’s
• EM theory: non-constant gyromagnetic ratio for D>4
• Analytical Kaluza-Klein solutions in EMD theory• (Odd-D) EMCS theory: D=5 is a special case• =1: supersymmetry marks a borderline
between stability and instability• Four types of black holes (for >2)• Non-uniqueness (for >2)
Conclusions