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02/07/2026, 13:30
We report on the numerical evolutions of black holes with synchronized or resonant hair. We show that in the "very hairy" regime, the horizon gets naturally ejected from the center of its environment. This dynamical splitting is likely to be generic for sufficiently hairy BHs in the broader class of models with synchronized or resonant hair, but possible exceptions may exist.
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02/07/2026, 13:55
Real scalar fields, e.g. the axion, cannot condensate into stationary solitonic configurations to form starlike structures, eventually either dispersing or collapsing. However, by relaxing the stationarity condition on the metric, it has been shown that oscillatory solitonic solutions—known as oscillatons—exist. Oscillatons share several properties with boson stars, including comparable...
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02/07/2026, 14:20
Recent observations of polarized light from galactic cores motivate the study of polarized exotic compact objects (ECOs), which can mimic the features of black holes (BHs) in the strong-field regime of gravity. In this work, the properties of three ultra-compact classes of models containing light rings are studied — relativistic thin-shell fluid spheres, thin-shell gravitational vacuum stars,...
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02/07/2026, 14:45
The complete set of covariant equations that govern the locally rotationally symmetric torsion spacetimes sourced by Weyssenhoff fluid in Einstein-Cartan-Sciama-Kibble gravity is presented. Using these equations, one can explore in detail the peculiar relationship between conformal structure and torsion. A comprehensive scheme to categorize these torsional spacetimes into distinct classes is...
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