Self-interactions can stabilize excited boson stars

Sanchis-Gual, Nicolas; Herdeiro, Carlos; Radu, Eugen

doi:10.48550/arxiv.2110.03000

“…It has been previously established that the excited solutions in various boson star models decay to the ground state[106,107]. However, there are recent indications that sufficiently strong self-interactions can stabilise excited states over long time scales at least for SIBSs[108].…”

mentioning

confidence: 99%

Soliton boson stars, Q-balls and the causal Buchdahl bound

Bošković¹,

Barausse²

2022

J. Cosmol. Astropart. Phys.

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Self-gravitating non-topological solitons whose potential admits multiple vacua are promising candidates for exotic compact objects. Such objects can arise in several extensions of the Standard Model and could be produced in the early Universe. In this work, we focus on objects made from complex scalars (gravitating Q-balls/soliton boson stars), deriving analytic solutions in spherical symmetry and comparing them with fully numerical ones. In the high-compactness limit we find that these objects present an effectively linear equation of state, thus saturating the Buchdahl limit with the causality constraint. Far from that limit, these objects behave either as flat space-time Q-balls or (in the low-compactness limit) as mini boson stars stabilized by quantum pressure. We establish the robustness of this picture by analyzing a variety of potentials (including cosine, quartic and sextic ones).

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“…was considered in many works, see e.g. [18][19][20]. Such potential can stabilize excited BSs, however the corresponding solutions do not posses the flat space limit.…”

Section: A Potentialmentioning

confidence: 99%

Boson Stars

Shnir¹

2022

Preprint

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We review particle-like configurations of complex scalar field, localized by gravity, so-called boson stars. In the simplest case, these solutions posses spherical symmetry, they may arise in the massive Einstein-Klein-Gordon theory with global U (1) symmetry, as gravitationally bounded lumps of scalar condensate. Further, there are spinning axially symmetric boson stars which possess non-zero angular momentum, and a variety of non-trivial multipolar stationary configurations without any continuous symmetries. In this short overview we discuss important dynamic properties

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“…It has been previously established that the excited solutions in various boson star models decay to the ground state [104,105]. However, there are recent indications that sufficiently strong self-interactions can stabilise excited states over long time scales at least for SIBSs [106]. [84,91,92,96].…”

Section: Representative Configurationsmentioning

confidence: 99%

Soliton boson stars, Q-balls and the causal Buchdahl bound

Bošković,

Barausse

2021

Preprint

View full text Add to dashboard Cite

Self-gravitating non-topological solitons whose potential admits multiple vacua are promising candidates for exotic compact objects. Such objects can arise in several extensions of the Standard Model and could be produced in the early Universe. In this work, we focus on objects made from complex scalars (gravitating Q-balls/soliton boson stars), deriving analytic solutions in spherical symmetry and comparing them with fully numerical ones. In the high-compactness limit we find that these objects present an effectively linear equation of state, thus saturating the Buchdahl limit with the causality constraint. Far from that limit, these objects behave either as flat space-time Q-balls or (in the low-compactness limit) as mini boson stars stabilized by quantum pressure. We establish the robustness of this picture by analyzing a variety of potentials (including cosine, quartic and sextic ones).

show abstract

Self-interactions can stabilize excited boson stars

Cited by 3 publications

References 38 publications

Soliton boson stars, Q-balls and the causal Buchdahl bound

Soliton boson stars, Q-balls and the causal Buchdahl bound

Boson Stars

Soliton boson stars, Q-balls and the causal Buchdahl bound

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