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- W3100815098 abstract "We show that minimal boson stars, i.e. boson stars made out of scalar fields without self-interaction, are always classically unstable in 5 space-time dimensions. This is true for the non-rotating as well as rotating case with two equal angular momenta and in both Einstein and Gauss-Bonnet gravity, respectively, and contrasts with the 4-dimensional case, where classically stable minimal boson stars exist. We also discuss the appearance of ergoregions for rotating boson stars with two equal angular momenta. While rotating black holes typically possess an ergoregion, rotating compact objects without horizons such as boson stars have ergoregions only in a limited range of the parameter space. In this paper, we show for which values of the parameters these ergoregions appear and compare this with the case of standard Einstein gravity. We also point out that the interplay between Gauss-Bonnet gravity and rotation puts constraints on the behaviour of the space-time close to the rotation axis." @default.
- W3100815098 created "2020-11-23" @default.
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- W3100815098 date "2016-02-22" @default.
- W3100815098 modified "2023-09-23" @default.
- W3100815098 title "Minimal boson stars in 5 dimensions: classical instability and existence of ergoregions" @default.
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- W3100815098 doi "https://doi.org/10.1088/0264-9381/33/6/065002" @default.
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