Abstract
Abstract
Black holes are thought to describe the geometry of massive, dark compact objects in the Universe. To further support and quantify this long-held belief requires knowledge of possible, if exotic alternatives. Here, we wish to understand how compact can self-gravitating solutions be. We discuss theories with a well-posed initial value problem, consisting in either a single self-interacting scalar, vector or both. We focus on spherically symmetric solutions, investigating the influence of self-interacting potentials into the compactness of the solutions, in particular those that allow for flat-spacetime solutions. We are able to connect such stars to hairy black hole solutions, which emerge as a zero-mass black hole. We show that such stars can have light rings, but their compactness is never parametrically close to that of black holes. The challenge of finding black hole mimickers to investigate full numerical-relativity binary setups remains open.
Funder
H2020 Marie Skłodowska-Curie Actions
Japan Society for the Promotion of Science
European Cooperation in Science and Technology
Fundação para a Ciência e a Tecnologia
Villum Fonden
Conselho Nacional de Desenvolvimento Científico e Tecnológico
H2020 European Research Council
Fundação Amazônia Paraense de Amparo à Pesquisa
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Subject
Physics and Astronomy (miscellaneous)
Cited by
13 articles.
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