Wormholes in Space-Time: Theory and Facts

A special issue of Universe (ISSN 2218-1997).

Deadline for manuscript submissions: closed (31 January 2019) | Viewed by 15202

Special Issue Editors

Associate Professor, Department of Theoretical Physics & IFIC, University of Valencia & CSIC, C/ Dr. Moliner 50, 46100 Burjassot, Valencia, Spain
Interests: black holes; singularities; quantum fields in curved space-time; inflation; modified gravity; Palatini formalism; stellar structure models; compact objects
Special Issues, Collections and Topics in MDPI journals
Institute of Astrophysics and Space Sciences, University of Lisbon, 1749-016 Lisboa, Portugal
Interests: modified gravity; dark energy; cosmology; dark matter; black holes; energy conditions; causal structure of spacetime
Special Issues, Collections and Topics in MDPI journals
Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências da Universidade de Lisboa, Edifício C8, Campo Grande, P-1749-016 Lisbon, Portugal
Interests: black holes; modified gravity; cosmology; bouncing solutions; spacetime singularities; nonlinear electrodynamics; field theory; topological defects; metric-affine geometry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The interest in the physics of wormholes has increased considerably in the last few years, boosted mainly by both the need for observationally discriminating them from other compact objects and the possibility of avoiding the violation of the energy conditions by considering modified gravitational dynamics. A variety of methods have been proposed for their empirical characterization, ranging from the analysis of gravitational waveforms or the lensing of background sources to the properties of accretion disks around them and the observation of their shadow. As a result, and analogously with black holes, which for some time were regarded as exotic solutions of the gravitational field equations, wormholes can presently be considered as a plausible physical reality. They defy our understanding of key physical principles, such as causality or the no-cloning of quantum information, and the deep implications that their existence entails are as appealing as the reasons argued for their non-existence. In fact, there is no theorem ruling out wormhole geometries.

Hoping it will serve as a basic and updated reference, this Special Issue will cover all current research avenues on this exciting field: Astrophysical and cosmological implications of wormholes, the role of dark energy and/or modified gravity for their structure, analogue and condensed matter models, extra dimensions, non-Riemannian extensions with non-metricity and/or torsion, geons, implications for the quantum theory, stability and perturbations, non-minimal couplings, accretion disks, lensing, shadows, thin-shell models, gravitational waveforms, time machines, etc. 

Dr. Gonzalo J. Olmo
Dr. Francisco S. N. Lobo
Dr. Diego Rubiera-Garcia
Guest Editors

Manuscript Submission Information

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Published Papers (5 papers)

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Editorial

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3 pages, 151 KiB  
Editorial
Post-Editorial of the Special Issue “Wormholes in Space-Time: Theory and Facts”
Universe 2020, 6(12), 228; https://doi.org/10.3390/universe6120228 - 30 Nov 2020
Viewed by 1562
Abstract
Wormholes made their first appearance in gravitational physics as soon as in 1916 but, as with their black hole cousins, it took a long time and effort for their true nature to be properly understood [...] Full article
(This article belongs to the Special Issue Wormholes in Space-Time: Theory and Facts)

Research

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9 pages, 1365 KiB  
Article
Light Propagation through Nanophotonics Wormholes
Universe 2018, 4(12), 137; https://doi.org/10.3390/universe4120137 - 29 Nov 2018
Cited by 5 | Viewed by 3376
Abstract
We consider the propagation of light along a 3D nanophotonic structure with the spatial shape of a spacetime containing a traversable wormhole. We show that waves experience significant changes of phase and group velocities when propagating along this curved space. This experiment can [...] Read more.
We consider the propagation of light along a 3D nanophotonic structure with the spatial shape of a spacetime containing a traversable wormhole. We show that waves experience significant changes of phase and group velocities when propagating along this curved space. This experiment can be realized with state-of-the-art nanophotonics technology. Full article
(This article belongs to the Special Issue Wormholes in Space-Time: Theory and Facts)
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12 pages, 343 KiB  
Article
Parameter Estimation of Wormholes beyond the Heisenberg Limit
Universe 2018, 4(11), 115; https://doi.org/10.3390/universe4110115 - 06 Nov 2018
Cited by 4 | Viewed by 2330
Abstract
We propose to exploit the quantum properties of nonlinear media to estimate the parameters of massless wormholes. The spacetime curvature produces a change in length with respect to Minkowski spacetime that can be estimated in principle with an interferometer. We use quantum metrology [...] Read more.
We propose to exploit the quantum properties of nonlinear media to estimate the parameters of massless wormholes. The spacetime curvature produces a change in length with respect to Minkowski spacetime that can be estimated in principle with an interferometer. We use quantum metrology techniques to show that the sensitivity is improved with nonlinear media and propose a nonlinear Mach–Zehnder interferometer to estimate the parameters of massless wormholes that scales beyond the Heisenberg limit. Full article
(This article belongs to the Special Issue Wormholes in Space-Time: Theory and Facts)
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21 pages, 316 KiB  
Article
Effects of Scattering of Radiation on Wormholes
Universe 2018, 4(2), 35; https://doi.org/10.3390/universe4020035 - 12 Feb 2018
Cited by 9 | Viewed by 2734
Abstract
Significant progress in the development of observational techniques gives us the hope to directly observe cosmological wormholes. We have collected basic effects produced by the scattering of radiation on wormholes, which can be used in observations. These are the additional topological damping of [...] Read more.
Significant progress in the development of observational techniques gives us the hope to directly observe cosmological wormholes. We have collected basic effects produced by the scattering of radiation on wormholes, which can be used in observations. These are the additional topological damping of cosmic rays, the generation of a diffuse background around any discrete source, the generation of an interference picture, and distortion of the cosmic microwave background (CMB) spectrum. It turns out that wormholes in the leading order mimic perfectly analogous effects of the scattering of radiation on the standard matter (dust, hot electron gas, etc.). However, in higher orders, a small difference appears, which allows for disentangling effects of wormholes and ordinary matter. Full article
(This article belongs to the Special Issue Wormholes in Space-Time: Theory and Facts)

Other

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12 pages, 305 KiB  
Letter
Linear Potentials in Galaxy Halos by Asymmetric Wormholes
Universe 2018, 4(11), 112; https://doi.org/10.3390/universe4110112 - 29 Oct 2018
Cited by 9 | Viewed by 2670
Abstract
A spherically symmetric space-time solution for a diffusive two measures theory is studied. An asymmetric wormhole geometry is obtained where the metric coefficients has a linear term for galactic distances and the analysis of Mannheim and collaborators, can then be used to describe [...] Read more.
A spherically symmetric space-time solution for a diffusive two measures theory is studied. An asymmetric wormhole geometry is obtained where the metric coefficients has a linear term for galactic distances and the analysis of Mannheim and collaborators, can then be used to describe the galactic rotation curves. For cosmological distances a de-Sitter space-time is realized. Center of gravity coordinates for the wormhole are introduced which are the most suitable for the collective motion of a wormhole. The wormholes connect universes with different vacuum energy densities which may represent different universes in a “landscape scenario”. The metric coefficients depend on the asymmetric wormhole parameters. The coefficient of the linear potential is proportional to both the mass of the wormhole and the cosmological constant of the observed universe. Similar results are also expected in other theories like k-essence theories, that may support wormholes. Full article
(This article belongs to the Special Issue Wormholes in Space-Time: Theory and Facts)
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