## Abstract

Abstract: We consider N = 2 supergravity in four dimensions, coupled to an arbitrary number of vector- and hypermultiplets, where abelian isometries of the quaternionic hyperscalar target manifold are gauged. Using a static and spherically or hyperbolically symmetric ansatz for the fields, a one-dimensional effective action is derived whose variation yields all the equations of motion. By imposing a sort of Dirac charge quantization condition, one can express the complete scalar potential in terms of a superpotential and write the action as a sum of squares. This leads to first-order flow equations, that imply the second-order equations of motion. The first-order flow turns out to be driven by Hamilton’s characteristic function in the Hamilton-Jacobi formalism, and contains among other contributions the superpotential of the scalars. We then include also magnetic gaugings and generalize the flow equations to a symplectically covariant form. Moreover, by rotating the charges in an appropriate way, an alternative set of non-BPS first-order equations is obtained that corresponds to a different squaring of the action. Finally, we use our results to derive the attractor equations for near-horizon geometries of extremal black holes.

Original language | English |
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Article number | 8 |

Journal | Journal of High Energy Physics |

Volume | 2016 |

Issue number | 4 |

DOIs | |

State | Published - 1 Apr 2016 |

Externally published | Yes |

## Keywords

- Black Holes
- Black Holes in String Theory
- Supergravity Models
- Superstring Vacua

## ASJC Scopus subject areas

- Nuclear and High Energy Physics