Abstract
After a brief introduction to the Attractor Mechanism, we review the appearance of groups of type \(E_{7}\) as generalized electric-magnetic duality symmetries in locally supersymmetric theories of gravity, with particular emphasis on the symplectic structure of fluxes in the background of extremal black hole solutions, with one or two centers. In the latter case, the role of an “horizontal” symmetry \(SL_{h}\left( 2,\mathbb{R }\right) \) is elucidated by presenting a set of two-centered relations governing the structure of two-centered invariant polynomials.
Based on Lectures given by SF and AM at the School “Black Objects in Supergravity” (BOSS 2011), INFN—LNF, Rome, Italy, May 9-13 2011. To appear in the Proceedings.
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Notes
- 1.
We recall that a point \(x_{fix}\) where the phase velocity \(v\left( x_{fix}\right) \) vanishes is called a fixed point, and it gives a representation of the considered dynamical system in its equilibrium state,
$$\begin{aligned} v\left( x_{fix}\right) =0. \end{aligned}$$The fixed point is said to be an attractor of some motion \(x\left( t\right) \) if
$$\begin{aligned} lim_{t\rightarrow \infty }x(t)=x_{fix}. \end{aligned}$$ - 2.
- 3.
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Acknowledgments
The reported results were obtained in different collaborations with Laura Andrianopoli, Leron Borsten, Anna Ceresole, Riccardo D’Auria, Mike Duff, G. W. Gibbons, Murat Günaydin, Renata Kallosh, Emanuele Orazi, William Rubens, Raymond Stora, A. Strominger, Mario Trigiante, and Armen Yeranyan, which we gratefully acknowledge. This work is supported by the ERC Advanced Grant no. 226455, “Supersymmetry, Quantum Gravity and Gauge Fields” (SUPERFIELDS).
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Ferrara, S., Marrani, A. (2013). On Symmetries of Extremal Black Holes with One and Two Centers. In: Bellucci, S. (eds) Black Objects in Supergravity. Springer Proceedings in Physics, vol 144. Springer, Heidelberg. https://doi.org/10.1007/978-3-319-00215-6_9
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