|
Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2007, Volume 85, Issue 1, Pages 3–8
(Mi jetpl937)
|
|
|
|
This article is cited in 92 scientific papers (total in 92 papers)
GRAVITY, ASTROPHYSICS
No realistic wormholes from ghost-free scalar-tensor phantom dark energy
K. A. Bronnikovab, A. A. Starobinskiic a Centre of Gravitation and Fundamental Metrology, VNIIMS
b Institute of Gravitation and Cosmology, PFUR
c Landau Institute for Theoretical Physics RAS
Abstract:
It 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 $f(\Phi)$ is everywhere positive and the scalar field $\Phi$ itself is not a ghost. Some special static, spherically symmetric wormhole solutions may exist if $f(\Phi)$ 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 $f$.
Received: 07.12.2006
Citation:
K. A. Bronnikov, A. A. Starobinskii, “No realistic wormholes from ghost-free scalar-tensor phantom dark energy”, Pis'ma v Zh. Èksper. Teoret. Fiz., 85:1 (2007), 3–8; JETP Letters, 85:1 (2007), 1–5
Linking options:
https://www.mathnet.ru/eng/jetpl937 https://www.mathnet.ru/eng/jetpl/v85/i1/p3
|
Statistics & downloads: |
Abstract page: | 539 | Full-text PDF : | 128 | References: | 67 |
|