Stability and collisions of excited spherical boson stars: glimpses of chains and rings
arXiv:2506.06442 · doi:10.1103/8bwz-wqhp
Abstract
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.
19 pages, 22 figures, updated to match the published version
References in corpus (20)
- GW190521 as a merger of Proca stars: a potential new vector boson of eV
- Head-on collisions of boson stars
- The imitation game: Proca stars that can mimic the Schwarzschild shadow
- Shadows of boson and Proca stars with thin accretion disks
- Asymptotically flat scalar, Dirac and Proca stars: discrete vs. continuous families of solutions
- Lensing and dynamics of ultra-compact bosonic stars
- Stability of rotating scalar boson stars with nonlinear interactions
- Spherical Boson Stars as Black Hole mimickers
- Gravitational waves and kicks from the merger of unequal mass, highly compact boson stars
- Supermassive black holes or boson stars? Hair counting with gravitational wave detectors
- Dynamical formation and stability of fermion-boson stars
- Comparing timelike geodesics around a Kerr black hole and a boson star
- Synchronised gravitational atoms from mergers of bosonic stars
- Dynamical -boson stars: generic stability and evidence for non-spherical solutions
- The non-spherical ground state of Proca stars
- Stability and physical properties of spherical excited scalar boson stars
- Self-interacting dipolar boson stars and their dynamics
- On the linear stability of nonrelativistic selfinteracting boson stars
- Eccentric mergers of binary Proca stars
- Bifurcations in Bosonic Stars: chains and rings from spherical solutions