Questions tagged [wormholes]
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Terminology used in the Wikipedia article for wormholes
The lead section of the Wikipedia article for wormholes says the following:
More precisely it [a wormhole] is a transcendental bijection of the spacetime
continuum, an asymptotic projection of ...
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1answer
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Circumstances of a superluminal causality violation [closed]
In the case of the Roman ring, a traveler is able to go through a wormhole mouth and emerge at some point in the past without violating causality, so long as the time traveled back is less than the ...
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Why does a wormhole have this metric?
I asked this (or something similar) within another question and was asked to post it separately, so here goes:
The metric for flat Minkowski space is: $$ds^2 = -dt^2 +dr^2 +r^2(d\theta^2+d\phi^2\sin^...
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Flat spacetime with curved metric? Small change in metric drastically changes geometry? GR
I'm about to be taking an undergrad course in GR. I'm trying to get ahead of the game, and I've hit a problem.
The metric for flat Minkowski space (using the $-+++$ signature and $c=1$) is:
$$ds^2 = ...
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1answer
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How to relate the Schwarzschild time $t$ to the status of the wormhole featured in the Kruskal diagram?
The maximally extended Schwarzschild spacetime as described by a Kruskal diagram features a wormhole which is dynamical. As Kruskal time $T$ elapses, a spacelike hypersurface hits the past singularity,...
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Time reversal in Region III in the Kruskal-Szekeres coordinates
Here is a standard Kruskal-Szekeres diagram:
[]
The region III coordinate time $t$ is constant on lines through the origin going from $t = +\infty$ where regions III and IV intersect backwards to $t =...
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1answer
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Is the Schwarzschild wormhole (Einstein-Rosen Bridge) time dependent?
In Kruskal-Szekeres Coordinates for the Schwarzschild blackhole, we know that the wormhole "opens up" joining regions I and III between Kruskal times $T = -1$ (vertex of the green hyperbola below) and ...
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Can a wormhole change the wavelength of a light beam?
If a light beam went into one mouth of a wormhole, and came out the other, are their factors that would result in it coming out red or blue shifted? Examples, if it came out of a mouth that was in ...
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1answer
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Where is the “tube” of a wormhole relative to normal space?
If a wormhole could be described as two mouths connected by a tube of some length shorter than the mouths are separated in normal space, how is the "tube" able to be shorter than the normal space ...
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Would the space needed for a wormhole time machine prevent backwards time travel?
Let's say that there was a wormhole time machine where one would emerge from the distal end earlier than one entered the proximal end. Would the spacial separation required between the two mouths ...
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1answer
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Do wormholes have mass that depends on the spacial separation, the temporal separation, the relative motion of the two ends of the wormhole [duplicate]
If there was a wormhole connecting two spatially/temporally separate locations, would it have mass that depends on the spacial separation, the temporal separation, the relative motion of the two ends ...
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Are wormholes optical in nature? [closed]
What is the trending belief in wormholes? Do physicists believe they are optical in nature? Maybe created with photons? Or part of electromagnetism?
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Would inspiraling binary wormholes produce gravitation wave?
Mathematically I am wonder would two binary wormholes radiate intense energy as gravitational wave as they get closer and closer together, I like to know what happens to the mass (or negative mass) ...
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Is there any well-known holographic duality that allows wormholes and CTCs to exist?
Is there any well-known holographic duality (like AdS/CFT or holographic principle in string theory/black holes) that contains wormholes and Closed Timelike Curves?
I was discussing this with a ...
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1answer
134 views
When to use an orthonormal basis in GR?
I am working on a problem in the textbook Gravity: An Introduction to Einstein's General Relativity by Hartle. The problem is to show that an observer moving radially through the throat of the ...
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Would CTCs in wormholes change physical laws?
A wormhole is a speculative structure linking disparate points in spacetime, and is based on a special solution of the Einstein field equations solved using a Jacobian matrix and determinant.
(https:...
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1answer
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How would you make wormholes? [duplicate]
I know very little about general relativity. I know that objects with mass bend space. How would you arrange objects to get a wormhole? My main problem is that I do not understand how you would change ...
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2answers
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Time direction in the BH parallel exterior region
In the III region of the maximally extended Schwarzschild solution, described in the Kruskal coordinates , Sch. time runs in the reversed direction as compared to the I - event horizon III-II of the ...
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Could spooky action at a distance be explained by particles staying linked in another dimension? [closed]
The math suggests that there are 11 or more "dimensions", most of which we know very little about. What if entangled particles are linked in one of those "other dimensions" and when we separate them ...
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1answer
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Is ER= EPR a Hidden Variable Theory & If NOT Why?
John Bell showed that entanglement cannot be a local hidden variable theory in 1964. Leonard Susskind and Juan Malcadena have proposed that non-traversable wormholes, Einstein-Rosen bridges (ER) are ...
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3answers
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Does time exist at the center of a Black Hole?
A black hole is a wormhole resulting from a dead Star which is capable of sucking any mass/matter along its path due to Gravity. I was wondering what time would be like at the central point of the ...
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1answer
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What creates three dimensional wormholes? [duplicate]
I read online that wormholes are formed when the fabric of space time is bent, but visualisation was the bending of two dimensional space with a three dimensional object. So what bends three ...
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On the topology of the Einstein-Rosen bridge
I am currently working with Harvey Reall's notes on Black holes, and I have 2 questions concerning the interpretation of the Einstein-Rosen bridge.
After some algebra, we are faced with the metric:
$$...
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1answer
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Timehole - Black hole physics [closed]
If someone could shed some light so that I can think straight again that would be appreciated..
Anywho, since watching a video on what the universe may look like in trillions of years (each atom ...
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How wormhole in this paper behave?
I discovered this paper that describes a wormhole without the use of exotic mass, and wondered at what's this wormhole's behavior. The problem is I don't know what most of equation on this paper is ...
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1answer
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What would happen to a person's body if they entered a black hole? [duplicate]
One of the premises of the classic sci-fi show Farscape is that a person could travel through black holes, I'm curious as to what exactly would happen to a person body if you were to enter a black ...
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Super collider and black hole [closed]
I've read somewhere that to create a wormhole we would have to build a supercollider on the side of the solar system. If we were capable of doing this, would a supercollider of this scale create its ...
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1answer
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Does the physical separation of wormhole mouths in real space affect transit time through the throat?
So I've somehow built my wormhole. I've stuffed the thing with negative energy so it's stable and traversable. I've got one end in orbit around Earth and the other in orbit around Mars.
My question ...
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Kip Thorne's time traveling wormhole and conservation of energy
Using this article as a basis: https://www.space.com/28000-physicist-kip-thorne-wildest-theories.html
So you build a wormhole, put one end in your backyard (for convenience your backyard is on an ...
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1answer
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Why do wormholes necessarily alter time? Why don't they just make two places causally linked?
I've heard many-an-explanation of wormholes. From as a kid with the hole punch through paper, to the sci-fi something something magic, to popular YouTube science channels talking about how it could ...
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2answers
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Wormholes and Time Machines
According this paper:
Morris, Michael S. and Thorne, Kip S. and Yurtsever, Ulvi (1988) Wormholes, time machines, and the weak energy condition. Physical Review Letters, 61 (13). pp. 1446-1449. ...
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Can we use entangled black holes to form wormholes?
If any object can be made black hole by crushing it to its Schwarzschild radius, can we do the same process in two different points in the space keeping the quantum states of both the objects ...
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Effective mass of Ellis wormholes
Ellis wormholes are (described as) curved in space only, with no component of their curvature in the time part of spacetime. The geometry therefore causes no gravity.
If my understanding of ...
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1answer
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Could I see my back using a wormhole? [closed]
I was wondering if in a possible future we could see our own back using a wormhole instead of using a couple of mirrors.
4
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1answer
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Exterior derivative for the electrostatics of a wormhole
I am working in a manifold diffeomorphic to $\mathbb{R} \times \mathbb{S}^2$ with metric
$$g = dr^2 + f(r)^2\left(d\theta + \sin^2\theta~d\phi\right)$$
where $f(r)$ is always positive. Now, I posit ...
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Is a time loop possible? [duplicate]
Let's say that hypothetically we could travel faster than light. Would a ship travelling at lightspeed or faster than light travel create a time loop where it makes the same trip over and over again ...
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1answer
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Closed Trajectories in wormhole
This might seem trivial but if I want to go about finding closed trajectories in a wormhole with a metric:
$$ds^2=-dt^2+dr^2+(b^2+r^2)(d\theta^2+sin^2\theta d\phi^2)$$ how should I approach that?
Is ...
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1answer
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Would communication of information from the future require a block time structure? [closed]
If faster-than-light travel (through wormhole tunneling or some other exotic means) was discovered in future, such that it allows information to be communicated from the future to the present, what ...
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1answer
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Why can one not traverse a wormhole? Does it decay? Does it take infinite time to reach a wormhole?
Suppose that a wormhole is not traversable. But a wormhole is just spacetime, so what are the reasons why one cannot traverse a wormhole? If something tries to traverse a wormhole, would it be trapped ...
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1answer
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What is time travel and why is the grandfathers Paradox a Paradox?
While watching a talk given by Neil DeGrase Tyson, he says that if something happens on earth, it would take light 2 million years to get to Andromeda. In theory, if you could generate a wormhole and ...
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How to detect a wormhole?
Question
A wormhole is a possible solution to Einstein field equations. As far as I understand, the fact that they are a possible solution does not mean they actually exist.
Are we looking for ...
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1answer
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Could I enter in a wormhole?
Reading a question on sci-fi stack exchange I find the wikipedia article on Novikov self-consistency principle in which is described the Polchinski paradox and the solution proposed by Thorne and some ...
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2answers
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Would it be possible for a human to simply “step” through a traversable wormhole?
(For the purposes of a science-fiction story where the author is attempting to have as much basis in fact as possible) if one were to create or make use of a Morris-Thorne or similar traversable ...
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1answer
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Do wormholes violate the conservation of Interval
I have heard that wormholes are valid solutions to the field equations, like black holes or anything else. However, for everything I've learned about relativity and what wormholes are supposed to be ...
3
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1answer
112 views
Do polyhedral wormholes make sense?
Visser defines some class of wormholes with polyhedral mouthes, as a limit of smoothed polyhedrons as the radius of the edges go to zero. Does this limit actually make sense, as an actual spacetime? ...
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1answer
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Experimental Proof of Einstein-Rosen bridge
Question:
There are mathematical proofs available for the Einstein-Rosen bridge. But I was wondering whether there is experimental proof for such a thing. The general theory of relativity supports ...
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Can the mouths of a worm-hole be torus shaped?
Theoretically, most wormholes should have spherical mouths (if they exist). Could have a wormhole have torus-shaped mouths? What about other shapes?
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Is a self-wormhole possible?
If we think of a wormhole as two blackholes where points on each horizon are identified. Should a "self-wormhole" not also be possible?
e.g. where opposite points on the event horizon are identified?
...
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What is the gravity and effect of a Black Hole with two connected cones cut from it?
Any question about Black Holes or time travel seems to have some untested theory or incredibly complicated and prohibitively expensive solution, this question is no different.
While the second half ...
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Accelerating thin shell wormholes and closed timelike curves
The classical example of the conversion of a wormhole into a time machine is to consider two wormholes, one stationary and another one accelerating for some period before going back to its original ...
