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A wormhole is a hypothetical structure which connects disparate points in spacetime.It may be visualized as a tunnel with two ends at separate points in spacetime (i.e., different locations, different points in time, or both).
The Ellis drainhole is the earliest-known complete mathematical model of a traversable wormhole.It is a static, spherically symmetric solution of the Einstein vacuum field equations augmented by inclusion of a scalar field minimally coupled to the geometry of space-time with coupling polarity opposite to the orthodox polarity (negative instead of positive):
It involves a highly theoretical object called a “ring wormhole,” which is a type of wormhole that connects two regions of space, like a portal. Ring wormholes had previously been theorized to ...
A graphic representation of Wheeler's calculations of what quantum reality may look like at the Planck length. Quantum foam (or spacetime foam, or spacetime bubble) is a theoretical quantum fluctuation of spacetime on very small scales due to quantum mechanics.
This occurs when the two wormhole mouths, call them A and B, have been moved in such a way that it becomes possible for a particle or wave moving at the speed of light to enter mouth B at some time T 2 and exit through mouth A at an earlier time T 1, then travel back towards mouth B through ordinary space, and arrive at mouth B at the same time ...
In the 1996 edition of the book and subsequent editions, Hawking discusses the possibility of time travel and wormholes and explores the possibility of having a universe without a quantum singularity at the beginning of time. The 2017 edition of the book contained 12 chapters, whose contents are summarized below.
The space that this male fiddler crab (a chiral object) lives in, a Möbius strip, is non-orientable. Note that the fiddler crab flips to being its own mirror image with every complete circulation. In wormhole theory, a non-orientable wormhole is a wormhole connection that appears to reverse the chirality of anything passed
Paul Davies, How to build a time machine, 2002, Penguin popular science, ISBN 0-14-100534-3 gives a very brief non-mathematical description of Gott's alternative; the specific setup is not intended by Gott as the best-engineered approach to moving backwards in time, rather, it is a theoretical argument for a non-wormhole means of time travel.