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A Black Hole Could Spit Itself Out of Its Own Hair, Leaving a Boson Star in Its Wake : ScienceAlert (opens in a new tab)

sciencealert.com · 2026-09-29

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Claim 1 of 6Not checkedTheoretical physicists found a new way in which a 'hairy' black hole can decay: in a 'fission' scenario, the composite object separates into a black hole without hair and a self-gravitating lump of scalar matter, a boson star.View evidenceHide evidence

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Claim 2 of 6Not checkedIn numerical simulations of several hairy black-hole configurations, the researchers found the equilibrium between the black hole horizon and surrounding scalar field was not stable when general perturbations were allowed.View evidenceHide evidence

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Claim 3 of 6Not checkedThe study found two outcomes: 'absorption,' where the black hole devours the scalar field and becomes bald, and 'fission,' where a disturbance nudges the black hole off-center until it exits the scalar field while the boson-star-like matter remains together.View evidenceHide evidence

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Claim 4 of 6Not checkedThe researchers said the outcome depends partly on how compact the scalar hair is: more compact configurations tended toward absorption, while looser ones were more susceptible to fission, and this held across two scalar potentials.View evidenceHide evidence

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Claim 5 of 6Not checkedThe article says the work is primarily a toy model rather than a realistic model of astrophysical black holes because it relies on ordinary electric charge, which real black holes are expected to have only in very small amounts.View evidenceHide evidence

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Claim 6 of 6Not checkedThe authors suggested that if an astrophysically plausible version of the instability exists, a violent symmetry-breaking process of this type could produce a distinctive gravitational-wave signal.View evidenceHide evidence

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Spontaneous spherical symmetry breaking of black holes with resonant hair

Physical Review D · 2026

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Papers considered

The selected paper, plus nearby candidates.

Crossref, PubMed, Europe PMC · 16 candidate papers

Candidate

Black hole-boson star binaries: Gravitational wave signals and tidal disruption

Physical Review D · 2026 · Crossref

Source (opens in a new tab)
Candidate

Black Hole Perturbation Theory and Gravitational Self-Force

Handbook of Gravitational Wave Astronomy · 2021 · Crossref

Source (opens in a new tab)

And 10 more candidates considered.