Lorentzian wormholes: From Einstein to Hawking. Matt Visser (Washington U., St. Louis). ISBN: , Lorentzian wormholes: from Einstein to Hawking. Front Cover. Matt Visser. AIP Press, American Institute of Physics, – Science – pages. @ 23 January ; LATEX-ed Keywords: traversable wormholes, Lorentzian wormholes. Physical Review D

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More technically, the wormhole spacetime requires a distribution of energy that violates various energy wormgolessuch as the null energy condition along with the weak, strong, and dominant energy conditions. While traveling through a wormhole, subluminal slower-than-light speeds are used. The original Einstein—Rosen bridge was described in an article published in July More precisely it is a transcendental bijection of the spacetime continuum, an asymptotic projection of the Calabi—Yau manifold manifesting itself in Anti-de Sitter space.

American theoretical physicist John Archibald Wheeler inspired by Weyl’s work [4] coined the term “wormhole” in a paper cisser by Charles Misner: Ellis specifically rejected referring to the scalar field as ‘exotic’ because of the antiorthodox coupling, finding arguments for doing so unpersuasive. According to current theories on the nature of wormholes, construction of a traversable wormhole would require the existence of a substance with negative energy, often referred to as ” exotic matter “.

Wormholes connect two points in spacetime, which means that they would in principle allow travel in timeas well as in space. Journal of Geometry and Physics. Black Holes and Time Warps.

However, it is known that quantum effects can lead to small measurable violations of the null energy condition, [6]: This analysis forces one to consider situations Views Read Edit View history. A particle model in general relativity”. Alternatively, another way is to take one entrance of the wormhole and move it to within the gravitational field of an object that has higher gravity than the other entrance, and then return it to a position near the other entrance.

For this reason, the type of traversable wormhole they proposed, held open by a spherical shell of exotic matterwas from to referred to in the literature as a Morris—Thorne wormhole. A possible resolution to the paradoxes resulting from wormhole-enabled time travel rests on the many-worlds interpretation of quantum mechanics.

We call such a connection between the two sheets a “bridge”. Timelines in fiction in science fiction in games television series that include time travel.

Such an interaction prevents the formation of a gravitational singularity.

International Journal of Modern Physics D. Retrieved from ” https: Some Thoughts on Energy Conditions and Wormholes. In this case, a wormhole would appear as a hole in that surface, lead into a 3D tube the inside surface of a cylinderthen re-emerge at another location on the 2D surface with a hole similar to the entrance. A wormhole can be visualized as a tunnel with two ends, each at separate points in spacetime i.

Torsion naturally accounts for the quantum-mechanical, intrinsic angular momentum spin of matter.

The impossibility of faster-than-light relative speed only applies lodentzian. In other projects Wikimedia Commons. To see why exotic matter is required, consider an incoming light front traveling along geodesics, which then crosses the wormhole and re-expands on the other side.

A tool for teaching general relativity”. Wormholes are consistent with the general theory of relativitybut whether wormholes actually exist remains to be seen.

### Lorentzian wormholes: from Einstein to Hawking – Matt Visser – Google Books

I wouldn’t start from hereNew Scientist 1 February One type of non-traversable wormhole metric is the Schwarzschild solution see the first diagram:. The equations of the theory of general relativity have valid solutions that contain wormholes. According to the optical Raychaudhuri’s theoremthis requires a violation of the averaged null energy condition.

InMorris, Thorne and Yurtsever worked out how to convert a wormhole traversing space into one traversing time by accelerating one of its two mouths. This means that the interior black hole region can contain a mix of particles that fell in from either universe and thus an observer who fell in from one universe might be able to see light that fell in from the other oneand likewise particles from the interior white hole region can escape into either universe.

According to general relativity, the gravitational collapse of a sufficiently compact mass forms a singular Schwarzschild black hole. From Wikipedia, the free encyclopedia.

Fuller published a paper [12] showing that this type of wormhole is unstable if it connects two parts of the same universe, and that it will pinch off too quickly for light or any particle moving slower than light that falls in from one exterior region to make it to the other exterior region.

### Wormhole – Wikipedia

One significant limitation of such a time machine loerntzian that it is only possible to go as far back in time as the initial creation of the machine; [24]: In fiction, wormholes have also served as a method for time travel. Here, “maximally extended” refers to the idea that the spacetime should not have any “edges”: Modern Physics Letters A.

Grandfather paradox Causal loop. Journal of Nonlinear Phenomena in Complex Systems. What is left is the Ellis wormholea nongravitating, purely geometric, visxer wormhole.

## Matt Visser: Book

In some hypotheses where general relativity is modifiedit is wormholew to have a wormhole that does not collapse without having to resort to exotic matter. The first type of wormhole solution discovered was the Schwarzschild wormhole[7] which would be present in the Schwarzschild metric describing an eternal black holebut it was found that it would collapse too quickly for anything to wormholds from one end to the other.

In this way it would be much easier to traverse the distance since the two points are now touching. Time Travel and Warp Drives. Gravitational singularity Penrose—Hawking singularity theorems Primordial black hole Gravastar Dark star Dark-energy star Black star Eternally collapsing object Magnetospheric eternally collapsing object Wormuoles White hole Naked singularity Ring singularity Immirzi parameter Membrane paradigm Kugelblitz Wormhole Quasi-star.

An Introduction 2nd ed.