ECO-spotting: looking for extremely compact objects with bosonic fields

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 disc...

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Bibliographic Details
Published in:Classical and quantum gravity 2022-02, Vol.39 (3), p.34001
Main Authors: Cardoso, Vitor, Macedo, Caio F B, Maeda, Kei-ichi, Okawa, Hirotada
Format: Article
Language:English
Subjects:
boson stars
compact objects
exotic compact objects
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Summary: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.
ISSN:0264-9381
1361-6382
DOI:10.1088/1361-6382/ac41e7