This month, Living Reviews in Relativity has published two new articles, a major update of the review “Stationary Black Holes: Uniqueness and Beyond” by Piotr T. Chrusciel, Joao Lopes Costa, and Markus Heusler and a new article on “Dynamical Boson Stars” by Steven L. Liebling and Carlos Palenzuela.
Please find the abstracts and further details below.
Chrusciel, Piotr T. and Lopes Costa, Joao and Heusler, Markus
“Stationary Black Holes: Uniqueness and Beyond”
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The spectrum of known black-hole solutions to the stationary Einstein equations has been steadily increasing, sometimes in unexpected ways. In particular, it has turned out that not all black hole equilibrium configurations are characterized by their mass, angular momentum and global charges. Moreover, the high degree of symmetry displayed by vacuum and electrovacuum black-hole space-times ceases to exist in self-gravitating non-linear field theories. This text aims to review some developments on the subject and to discuss them in the light of the uniqueness theorem for the Einstein–Maxwell system.
Liebling, Steven L. and Palenzuela, Carlos
“Dynamical Boson Stars”
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The idea of stable, localized bundles of energy has strong appeal as a model for particles. In the 1950s, John Wheeler envisioned such bundles as smooth configurations of electromagnetic energy that he called geons, but none were found. Instead, particle-like solutions were found in the late 1960s with the addition of a scalar field, and these were given the name boson stars. Since then, boson stars find use in a wide variety of models as sources of dark matter, as black hole mimickers, in simple models of binary systems, and as a tool in finding black holes in higher dimensions with only a single killing vector. We discuss important varieties of boson stars, their dynamic properties, and some of their uses, concentrating on recent efforts.
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