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• W4220993364 abstract "A new class of complex scalar field objects, which generalize the well known boson stars, was recently found as solutions to the Einstein-Klein-Gordon system. The generalization consists in incorporating some of the effects of angular momentum, while still maintaining the spacetime's spherical symmetry. These new solutions depend on an (integer) angular parameter $ell$, and hence were named $ell$-boson stars. Like the standard $ell=0$ boson stars these configurations admit a stable branch in the solution space; however, contrary to them they have a morphology that presents a shell-like structure with a hole in the internal region. In this article we perform a thorough exploration of the parameter space, concentrating particularly on the extreme cases with large values of $ell$. We show that the shells grow in size with the angular parameter, doing so linearly for large values, with the size growing faster than the thickness. Their mass also increases with $ell$, but in such a way that their compactness, while also growing monotonically, converges to a finite value corresponding to about one half of the Buchdahl limit for stable configurations. Furthermore, we show that $ell$-boson stars can be highly anisotropic, with the radial pressure diminishing relative to the tangential pressure for large $ell$, reducing asymptotically to zero, and with the maximum density also approaching zero. We show that these properties can be understood by analyzing the asymptotic limit $ellrightarrowinfty$ of the field equations and their solutions. We also analyze the existence and characteristics of both timelike and null circular orbits, especially for very compact solutions." @default.
• W4220993364 created "2022-04-03" @default.
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• W4220993364 date "2022-04-14" @default.
• W4220993364 modified "2023-10-16" @default.
• W4220993364 title "Extreme ℓ-boson stars" @default.
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• W4220993364 doi "https://doi.org/10.1088/1361-6382/ac5fc2" @default.
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