Stability and collisions of excited spherical boson stars: glimpses of chains and rings
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| Format: | Preprint |
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2025
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| author | Brito, Marco Herdeiro, Carlos Radu, Eugen Sanchis-Gual, Nicolas Zilhão, Miguel |
| author_facet | Brito, Marco Herdeiro, Carlos Radu, Eugen Sanchis-Gual, Nicolas Zilhão, Miguel |
| contents | Scalar, spherically symmetric, radially excited boson stars were previously shown to be stabilized, against spherical dynamics, by sufficiently strong self-interactions. Here, we further test their stability now in a full 3+1D evolution. We show that the stable stars in the former case become afflicted by a non-spherical instability. Then, we perform head-on collisions of both (stable) fundamental and (sufficiently long-lived) excited boson stars. Depending on the stars chosen, either a black hole or a bosonic remnant are possible. In particular, collisions of excited stars result in a bosonic bound state which resembles a dynamical superposition of chains and rings, akin to the ones found as equilibrium solutions in Liang:2025myf. These evolutions emphasize a key difference concerning the dynamical robustness of fundamental vs. excited spherical boson stars, when generic (beyond spherical) dynamics is considered. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_06442 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Stability and collisions of excited spherical boson stars: glimpses of chains and rings Brito, Marco Herdeiro, Carlos Radu, Eugen Sanchis-Gual, Nicolas Zilhão, Miguel General Relativity and Quantum Cosmology Scalar, spherically symmetric, radially excited boson stars were previously shown to be stabilized, against spherical dynamics, by sufficiently strong self-interactions. Here, we further test their stability now in a full 3+1D evolution. We show that the stable stars in the former case become afflicted by a non-spherical instability. Then, we perform head-on collisions of both (stable) fundamental and (sufficiently long-lived) excited boson stars. Depending on the stars chosen, either a black hole or a bosonic remnant are possible. In particular, collisions of excited stars result in a bosonic bound state which resembles a dynamical superposition of chains and rings, akin to the ones found as equilibrium solutions in Liang:2025myf. These evolutions emphasize a key difference concerning the dynamical robustness of fundamental vs. excited spherical boson stars, when generic (beyond spherical) dynamics is considered. |
| title | Stability and collisions of excited spherical boson stars: glimpses of chains and rings |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2506.06442 |