Journal ArticleDOI
Wormholes in the Brans-Dicke theory of gravitation.
A. G. Agnese,M. La Camera +1 more
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In this paper, it was shown that the static spherically symmetric solutions to the Brans-Dicke theory of gravitation give rise either to a naked singularity or to a post Newtonian parameter γ 1.Abstract:
It is shown that the static spherically symmetric solutions to the Brans-Dicke theory of gravitation give rise either to a naked singularity if the post Newtonian parameter γ 1.read more
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Journal ArticleDOI
Wormhole geometries in f(R) modified theories of gravity
TL;DR: This work imposes that the matter threading the wormhole satisfies the energy conditions, so that it is the effective stress-energy tensor containing higher order curvature derivatives that is responsible for the null energy condition violation.
Journal ArticleDOI
Gravitational lensing by wormholes
TL;DR: Gravitational lensing by traversable Lorentzian wormholes is analyzed in this paper in the strong field limit. Wormhole solutions are considered in the Einstein minimally coupled theory and in the brane world model.
Journal ArticleDOI
Traversable wormholes from massless conformally coupled scalar fields
Carlos Barceló,Matt Visser +1 more
TL;DR: The massless conformally coupled scalar field is characterized by the so-called "new improved stress-energy tensor" which is capable of classically violating the null energy condition as mentioned in this paper.
Journal ArticleDOI
Static spherically symmetric wormholes in f(R, T) gravity
TL;DR: In this article, a static spherically symmetric geometry with matter contents as anisotropic, isotropic, and barotropic fluids in three separate cases was considered, and it was shown that the wormhole solutions are realistic and stable in this theory of gravity.
Journal ArticleDOI
Notes on wormhole existence in scalar-tensor and F(R) gravity
TL;DR: In this paper, it was shown that there are no vacuum wormhole solutions of the Brans-Dicke theory with zero potential and the coupling constant ω > −3/2, except for the case ω = 0; in the latter case, G ≥ 0 in the region beyond the throat.
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