No realistic wormholes from ghost-free scalar-tensor phantom dark energy

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dc.creatorBronnikov, Kirill A.
dc.creatorStarobinsky, Alexei A.
dc.date2006-12-05
dc.date.accessioned2026-07-07T11:21:35Z
dc.date.available2026-07-07T11:21:35Z
dc.descriptionIt is proved that no wormholes can be formed in viable scalar-tensor models of dark energy admitting its phantom-like ($w < -1$) behaviour in cosmology, even in the presence of electric or magnetic fields, if the non-minimal coupling function $f(Φ)$ is everywhere positive and the scalar field $Φ$ itself is not a ghost. Some special static, spherically symmetric wormhole solutions may exist if $f(Φ)$ is allowed to reach zero or to become negative, so that the effective gravitational constant becomes negative in some region making the graviton a ghost. If $f$ remains non-negative, such solutions require severe fine tuning and a very peculiar kind of model. If $f < 0$ is allowed, it is argued (and confirmed by previous investigations) that such solutions are generically unstable under non-static perturbations, the instability appearing right near transition surfaces to negative $f$.
dc.description8 pages, latex
dc.identifierhttps://arxiv.org/abs/gr-qc/0612032
dc.identifierhttp://arxiv.org/abs/gr-qc/0612032
dc.identifierJETPLett.85:1-5,2007; PismaZh.Eksp.Teor.Fiz.85:3-8.2007
dc.identifierdoi:10.1134/S0021364007010018
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194304
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleNo realistic wormholes from ghost-free scalar-tensor phantom dark energy
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