References. S. Cacciatori and D. Klemm, :
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2 References S. Cacciatori and D. Klemm, : Considered arbitrary static BPS spacetimes: very general, non spherical horizons, complicated BPS equations! G. Dall Agata and A. Gnecchi, Considered also dyonic solutions (see later) H. Looyestijn, K. Hristov, S.V.,
3 Intro & Motivation 1) BPS Black Holes in flat spacetime: Entropy, area law Microscopics, stringy realization, D branes Wall crossing phenomena; instantons and hypermultiplets 2) Black Holes in AdS spacetime: AdS 4 / CFT 3 and applications in CMT ( & QCD) Main interest in non BPS black holes, finite temperature. Here: study of BPS black holes!
4 Static AdS 4 black holes Static, spherically symmetric spacetimes (+,,, ) ds 2 = U 2 (r)dt 2 U 2 (r)dr 2 h 2 (r)(dθ 2 + sin 2 θdϕ 2 ) AdS 4 : U 2 (r) = 1 + g 2 r 2 ; h(r) = r (Λ = 3g 2 ) RN AdS 4 : U 2 (r) = 1 2M r + Q2 + P 2 r 2 + g 2 r 2 ; h(r) = r
5 Static AdS 4 black holes Einstein + Maxwell + cosmological constant L = g ( R(g) F µν F µν Λ) Minimally gauged N=2 D=4 supergravity BPS conditions (Romans 92): class 1) M = Q, P = 0 U 2 = (1 Q r )2 + g 2 r 2 No horizons, naked singularity at. Solution is r = 0 ½ BPS.
6 Static AdS 4 black holes Exotic BPS solution (Romans, 92) : class 2) : M = Q ; P = 1 2g U 2 (r) = (gr + 1 2gr )2 + Q2 r 2 Solution is ¼ BPS, again no horizon, naked singularity at. There is no flat spacetime r = 0 limit. g 0 HOW TO RESOLVE THE NAKED SINGULARITY??? WE WILL FIND MODELS: HORIZON LOCATED AT Q = 0 r H = U 2 (r) (gr + c 2g 2 c 2gr )2 ; c < 0
7 Ingredients Add extra vector multiplets in N=2 D=4 sugra, specified by prepotential. Non constant scalars. Abelian gaugings and non trivial scalar potential for the scalars. Simplest setting: Fayet Iliopoulos terms (gauging Rsymmetry), no hypermultiplets. [See also Cacciatori and Klemm, 09] The scalar potential must allow for N=2 AdS 4 vacua at infinity. This requires certain prepotentials +gaugings.
8 FI Gauged supergravity N=2 D=4 Lagrangian (ungauged part) z Λ = X Λ / X 0 L = R(g) + K ij z i z j + I ΛΣ (z)f Λ F Σ + R ΛΣ (z)ε µνρσ F µν Λ F ρσ Σ Add scalar potential V = g 2 (K i j f i Λ f j Σ 3L Λ L Σ )ξ Λ ξ Σ L Λ e K X Λ f i Λ e K /2 D i X Λ FI terms charge the gravitinos µ ψ ν A = µ ψ ν A i 2 gξ ΛA Λ µ σ 3B A ψ µb ; A, B = 1,2 ; e Λ gξ Λ
9 Quantization condition Since the FI terms determine the electric charges of the gravitinos, one expects a quantization condition in the presence of magnetic charges 2e Λ p Λ = n ; n In a theory which is electromagnetically gauged, one expects (see later) 2(e Λ p Λ m Σ q Σ ) = n ; n
10 BPS Black Hole Ansatz We only look for magnetically charged solutions: A ϕ Λ = p Λ cosθ ; q Λ = 0 Ansatz for Killing spinors (breaking to ¼ BPS): ε A = ε AB γ 0 ε B ; ε A = ±σ 3 ABγ 1 ε B
11 Attractor equations BPS conditions imply attractor flow equations: U r z i = K ij f j Λ ( 2I ΛΣ pσ h 2 gξ Λ ) r U = L Λ ( 2I ΛΣ p Σ gξ h 2 Λ ) U h rh = L Λ ( 2I ΛΣ pσ ± gξ h 2 Λ ) together with the quantization condition for n=1 (!!) 2gξ Λ p Λ = 1
12 Example I Simplest case: 1 vector multiplet. Prepotential F = 2i X 0 (X 1 ) 3 Look for solution of the form (ansatz) U(r) = e K /2 (gr + c 2gr ) ; h(r) = re K /2 Re(X Λ ) = H Λ ; Re(F Λ ) = 0 ; H Λ = α Λ + β Λ r
13 Example I Solution parametrized by 7 parameters (c, 2 constants in each harmonic function, 2 magnetic charges) The BPS equations relate most of these parameters to the FI terms, and one ends up with only three parameters, e.g. β 1 & ξ Λ ;Λ = 0,1 For instance, c = (gξ 1β 1 ) 2
14 Example I Horizon is located at (computed from g tt =0) r H = 16 3 (ξ 1β 1 ) 2 1 2g 2 Singularities at (where g tt diverges) r s = ±4ξ 1 β 1, r s = 4 3 ξ 1β 1 Black holes require r H > r S c < 1 2
15 Example I Entropy can be computed explicitly, and is function of gravitino and black hole charges, S = S(e Λ, p Λ ) ; e Λ gξ Λ Near horizon geometry is AdS 2 xs 2, but with unequal radii: R S 2 > 2R AdS2
16 M theory embedding The solution can first be embedded in D=4 N=8 sugra (1/16 BPS), by truncation, and then be lifted to D=11 [Duff and Liu, Cvetic et al., 99], D = 11 sugra on S 7 SO(8) gauged N = 8 sugra D = 4 Prepotential and FI terms: truncation to U(1) 4 N = 2 D = 4 F = 2i X 0 X 1 X 2 X 3 ; ξ Λ = 1 Λ = 0,1,2, 3
17 M theory embedding Microscopic description in terms of M2 branes. In D=4, there are no electric charges, hence M2 branes are not spinning The D=4 magnetic charges lift to NUT like charges. This implies that Kaluza Klein monopoles are present Bound state of M2 and KK? (More research needed)
18 Dyonic AdS 4 BH Trick: electromagnetic rotation of the purely magnetic black holes. [see also Dall Agata and Gnecchi] Technology: magnetic gaugings in N=2 D=4 sugra [D Auria et al., de Wit et al.] In our case: gravitinos get both electric and magnetic charges, which are mutually local. Dirac quantization condition: 2(e Λ p Λ m Σ q Σ ) = n ; n
19 Dyonic AdS 4 BH Solution has both electric and magnetic (dual) field strengths F θϕ Λ = pλ 2 sinθ ; G Σ,θϕ = q Σ 2 sinθ BPS solutions (ansatz) in terms of harmonic functions: Re(X Λ ) = H Λ ; Re(F Σ ) = H Σ
20 Example II Consider prepotential (truncated STU model) F = (X1 ) 3 This is the dual prepotential of Example I, related by a particular symplectic rotation. Gauging with one electric and one magnetic gauge field. Gravitino charges (e 0,m 1 ). This is needed to get an AdS 4 vacuum at infinity. Black hole is also dyonic: X 0 2(e 0 p 0 m 1 q 1 ) = ±1
21 Conclusions Initiated study of BPS black holes in gauged N=2 D=4 sugra. New BPS AdS black holes exist and avoid naked singularities! Magnetic and dyonic. Found attractor flow equations. M theory embedding: microscopic description? Generalizations to non BPS, non extremal?
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