Paper published by Eric W. Hirschmann, Luis Lehner, Steven L. Liebling and Carlos Palenzuela in *Physical Review D*.

**Black Hole Dynamics in Einstein-Maxwell-Dilaton Theory**

We consider the properties and dynamics of black holes within a family of alternative theories of gravity, namely Einstein-Maxwell-dilaton theory. We analyze the dynamical evolution of individual black holes as well as the merger of binary black hole systems. We do this for a wide range of parameter values for the family of Einstein-Maxwell-dilaton theories, investigating, in the process, the stability of these black holes. We examine radiative degrees of freedom, explore the impact of the scalar field on the dynamics of merger, and compare with other scalar-tensor theories. We argue that the dilaton can largely be discounted in understanding merging binary systems and that the end states essentially interpolate between charged and uncharged, rotating black holes. For the relatively small charge values considered here, we conclude that these black hole systems will be difficult to distinguish from their analogs within General Relativity.

Paper link available below at citation information

**Citation:**

Eric W. Hirschmann, Luis Lehner, Steven L. Liebling, Carlos Palenzuela

Black Hole Dynamics in Einstein-Maxwell-Dilaton Theory

Phys. Rev. D **97**, 064032

https://doi.org/10.1103/PhysRevD.97.064032

Published data: 26/03/2018

**(Figure 7 from the paper.** The (real part of the) l=m=2 mode of the scalar gravitational radiation Φ22 of a binary black hole with an electric charge qe=0.001for different values of α0. Top: The equal mass case. Bottom: The unequal mass case.)