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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Time Travel and Warp Drives. A follow-up paper to Misner and Wheeler December Gravitational singularity Wofmholes singularity theorems Primordial black hole Gravastar Dark star Dark-energy star Black star Eternally collapsing object Magnetospheric eternally collapsing object Fuzzball White hole Naked singularity Ring singularity Immirzi parameter Membrane paradigm Kugelblitz Wormhole Quasi-star.
Another way to imagine wormholes is to take a sheet of paper and draw two somewhat distant points on one side of the paper. Later, other types worhmoles traversable wormholes were discovered viswer allowable solutions to the equations of general relativity, including a variety analyzed in a paper by Matt Visserin which a path through the wormhole can be made where the traversing path does not pass through a region of exotic matter. American theoretical physicist John Archibald Wheeler inspired by Weyl’s work  coined the term “wormhole” in a paper co-authored by Charles Misner: A particle model in general relativity”.
Wormhole – Wikipedia
A tool for teaching general relativity”. One significant limitation of such a time machine is that it is only possible to go as far back in time as the initial creation of the machine; : Thermodynamics Schwarzschild radius M—sigma relation Event horizon Quasi-periodic oscillation Photon sphere Innermost stable circular vissser Ergosphere Hawking radiation Penrose process Blandford—Znajek process Bondi accretion Spaghettification Gravitational lens.
Wormholes have been defined both geometrically and topologically.
A particle returning from the future does not return to its universe of origination but to a parallel universe. An example of a traversable wormhole metric is the following: What is left is the Ellis wormholea nongravitating, purely geometric, traversable wormhole.
Formalizing this idea leads to definitions such as the following, taken from Matt Visser ‘s Lorentzian Wormholes As the wormhole neck is of finite size, we would not expect caustics to develop, at least within the vicinity of the neck. Archived from the original on June 27, 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.
From Wikipedia, the free encyclopedia.
Lorentzian wormholes: From Einstein to Hawking – INSPIRE-HEP
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.
InMatt Visser argued that the two mouths of a wormhole with such an induced clock difference could not be brought together without inducing quantum field and gravitational effects that would either make the wormhole collapse or the two mouths repel each other,  or otherwise prevent information from passing through the wormhole. An alternative to cosmic inflation”.
However, it is known that quantum effects can lead to small measurable violations of the null energy condition, : Note that the Schwarzschild metric describes an idealized black hole that exists eternally from the perspective of external observers; a more realistic black hole that forms at some particular time from a collapsing star would require a different metric.
A wormhole could connect extremely long distances such as a billion light years or more, viaser distances such as a few metersdifferent universesor different points in time. However, in the pure Gauss—Bonnet gravity a modification to general relativity involving extra spatial dimensions which is sometimes studied in the context of brane cosmology exotic matter is not needed in order for wormholes to exist—they can exist even with no matter.
In some hypotheses where general relativity is modifiedit is possible to have a wormhole that does not collapse without having to resort to exotic matter. We call such a connection between the two sheets a “bridge”.
The Physics of Stargates. Views Read Edit View history.
Timelines in fiction in science fiction in games television series that include time travel. Lorentzian traversable wormholes would allow travel in both directions from one part of the universe to another part of that same universe very quickly or would allow travel from one universe to another. The possibility of traversable wormholes in general relativity was first demonstrated in a paper by Homer Ellis  wormholss independently in a paper by K.
In fiction, wormholes have also served as a method for time travel. According to general relativity, the gravitational collapse of a sufficiently compact mass forms a singular Schwarzschild black hole. Kip Thorne and his graduate lorentian Mike Morrisunaware of the papers by Ellis and Bronnikov, manufactured, and in published, a duplicate of the Ellis wormhole for use as a tool for teaching general relativity.
When the infalling stellar matter is added to a diagram of a black hole’s history, it removes the part of the diagram corresponding to the white hole interior region, along loentzian the part of the diagram corresponding to the other universe.
For a simplified notion of a wormhole, space can be visualized as a two-dimensional 2D surface. An actual wormhole would be analogous to this, but with the spatial dimensions raised by one.
Wormholes are consistent with the general theory of relativitybut whether wormholes actually exist remains to be seen. Black holes Most massive Nearest Quasars. The first type of wormhole solution discovered was the Schwarzschild wormhole 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 cross from one end to the other.
Matt Visser: Book
The expansion goes from negative to positive. More technically, the wormhole spacetime requires a distribution of energy that violates various energy conditionssuch as the null energy condition along with the weak, strong, and dominant energy conditions.
Here, “maximally extended” refers to the idea that the spacetime should not have any “edges”: Classical and Quantum Gravity. An excellent and more concise review.