Questions tagged [wormholes]
The wormholes tag has no usage guidance.
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How can dense quark matter stabilize wormholes?
I have read in several articles, such as
https://www.sciencedirect.com/science/article/abs/pii/S0577907323000266 and https://arxiv.org/abs/1403.0771 that dense quark matter can stabilize wormholes. ...
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Lectures on wormholes
I am currently writing a review as a thesis project and I must cover black holes and wormholes, static and stationary. For black holes I found this lecture where black holes are approached from a more ...
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What are the current theoretical limits on the size of a wormhole?
What are the current theoretical limits on the size of a wormhole?
Some physicists believe that wormholes could be as small as the Planck length, which is about 10^-35 meters. Others believe that ...
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Wormhole Metrics and the Density of Negative Energy
I've noticed quite a bit of the literature on wormholes, warp drives, etc. try to reduce the overall quantity of negative mass-energy their spacetimes require, but I have seen little discussion ...
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Where does the parallel universe in the Penrose diagram come from?
In this diagram, as well as our universe, you have a parallel universe.
Where does this come from? Is this just a artifact of the diagram, or is it predicted by the maths in some sort.
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Self-connected Einstein-Rosen wormhole
The Einstein-Rosen wormhole is described by the metric
$$ \begin{equation}
\mathrm{d} s^{2}=\frac{u^{2}}{u^{2}+2 m} \mathrm{d} t^{2}-4\left(u^{2}+2 m\right) \mathrm{d} u^{2}-\left(u^{2}+2 m\right)^...
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How is a wormhole (Einstein-Rosen Bridge) different than a tunnel?
What is the difference between an Einstein-Rosen Bridge (wormhole) and a tunnel through a mountain? Obviously, light that travelled around the mountain would take longer to reach other side so that ...
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Wormholes as instantons?
Are all wormholes gravitational instantons in the context of General Relativity?
My question concerns also the topology of spacetime in such case.
A full Wick rotation of the metric, seems to change ...
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Singularities and Horizons
Well, the Morris and Thorne article on wormholes states that the function $\Phi(r)$ of metric
$$
ds^2 = -e^{2\Phi(r)}c^2dt^2 + dr^2/(1 - b(r)/r)+r^2(d\theta^2 + sin^2\theta\hspace{0.1cm} d\phi^2)
...
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Where does the singularity go in an Einstein-Rosen Bridge?
I've been reading up on some material about black holes and Einstein-Rosen bridges. Generally it is said that a black hole is defined by the event horizon (boundary in space where the gravitational ...
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Would a wormhole need a constant supply of negative energy?
According to most sources, a stable, traversable wormhole can only be created if it is stabilised using negative energy, or some other form of exotic matter. (I’m going with negative energy, because ...
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Is momentum conserved in a traversable wormhole?
Wikipedia says:
A wormhole (Einstein-Rosen bridge) is a hypothetical structure connecting disparate points in spacetime, and is based on a special solution of the Einstein field equations.
If a ...
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How to distinguish the cause of wavelength and frequency change?
In the theory of relativity, wavelength and frequency will change due to space-time geometry; in quantum mechanics, wavelength and frequency will change due to energy radiation, so how to distinguish ...
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Analytical Integration of Wormhole Orbits
Is there any way lightlike or timelike orbits in this metric can be found analytically?
$$ds^2=-dt^2+dp^2+\frac{1}{5p^2+4t^2}$$
The $1$ in the numerator is the squared angular momentum.
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About the paper "Traversable wormhole dynamics on a quantum processor"
Recently a paper titled "Traversable wormhole dynamics on a quantum processor" was published in Nature.
From what I understand they are simulating these wormholes (dual of an $AdS_2$ ...
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How can we know if our big bang is a one side of a wormhole?
According to Hawking, he proved that (excluding quantum mechanics) the big bang started at a singularity. Hence showing a connection between the mathematics of the big bang and black holes.
Equally, ...
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How would portals behave with dilation of time if they existed?
I've a weird question which is more a sci-fi question than a physics question, but i need people who know physics to have any hope of interesting answers :p
I was rewatching the scene of Interstellar (...
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Stabilization of "small" wormholes in an expanding space
Forget about wormhole-stabilizing fields and energies. Wheeler and Fuller's paper describe the expansion and subsequent collapse of a created wormhole.
Essentially they describe a created wormhole as ...
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Nonlocal Gravitational energy: How to localize nontrivial topology in GR?
Ok, This question has been beaten to death. I just wanted to look at it from a slightly different angle: Einstein, Rosen, and later Wheeler considered the possibility of particles as spacetime ...
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Violations of the Achronal averaged null energy condition
Many energy conditions have been shown to be violated in the past in semiclassical gravity, for instance when considering Klein-Gordon quantum scalar fields. Victims include the WEC (Weak Energy ...
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Does travel through static wormhole(s) allow time-travel to the past? (Does one-way Tachyonic antitelephone compatible with reality?)
I'm trying to understand if faster-than-light travel via static wormholes is compatible with our current view of the Universe.
https://en.wikipedia.org/wiki/Tachyonic_antitelephone
gives two examples: ...
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What the end of a traversable wormhole looks like?
Looking at the picture below, I assume that the wormhole will have some kind of horizon, either sharp of smooth, and will be about spherical. But in principle we should be able to see the universe ...
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Can wormholes form between two distant regions of an otherwise flat spacetime?
Let us assume a universe that is mostly flat on medium and large scales. Suppose we have exotic matter and could make a wormhole. Then you move one of the entrances to the wormhole very far away. Now ...
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Closed time loops and causality in general relativity
I always read that GR does not seem to prevent closed time loops. This does not sound too crazy if you could somehow create a traversable wormhole (and move one of the ends fast and long to make the ...
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Penrose conformal diagram of Morris-Thorne wormhole
Consider the classical Morris-Thorne wormhole solution:
$$\tag{1}
ds^2 = dt^2 - dr^2 - (r^2 + a^2) \,d\Omega^2,
$$
where $a$ is a positive constant, $r > 0$ for one asymptoticaly flat spacetime, ...
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Would a person split in half if entering a portal to a "mirrored world"? [closed]
I tried making the title worded as good as possible, but let me explain some more:
SPOILER FOR STRANGER THINGS SEASON 4
In episode seven they climb a rope up into the portal and when they enter the ...
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Morris-Thorne Metric Redshift Function
Why is the Morris-Thorne metric sometimes written with a redshift function and sometimes without?
Here is the version with the redshift function.
$ds^2=-e^{2\Phi}dt^2+\frac{1}{1-\frac{b}{r}}dr^2+r^2d\...
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About wormholes and exotic solutions to fundamental equations
Wormholes originate from a special solution of the Einstein field equations (EFE), equations which are fundamental to general relativity. However, there seems to be a reason as to why these objects ...
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How (if) can we connect a 2D "throat" piece of a wormhole to two hyperbolic 2D manifolds?
This question wad closed on the mathematics site, as it lacked clarity. So I try my luck here. My question is cosmology-inspired.
Imagine two 2D hyperbolic manifolds. I connect them by a manifold like ...
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How long would it take to build a wormhole? [closed]
If it were possible to build wormholes, would the process of building them also be faster than light as seen outside the wormhole, or would it take at least as much time as it would light to traverse ...
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Does discovery of graviton disprove wormhole since latter is applicable in GR only?
I know graviton is only a hypothetical particle invented probably to serve as a placeholder in standard model, but suppose one day we discovered graviton, does this disprove the existence of wormhole ...
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Could Planck scale wormholes be a solution for non-locality?
When two entangled particles are separated, an observation made on one particle seems to be able to act at a distance to determine the state of the other particle. Is it possible, or has anyone in ...
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Spacetime distortion and wormholes
Consider the fact that the curvature of spacetime and its relation to matter is given by the EFEs $$R_{\mu\nu}-\frac{1}{2}Rg_{\mu\nu}=\frac{8\pi G}{c^4} T_{\mu\nu}.$$ It is well known that the left ...
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Wheeler-Regge analysis of $R \neq 0$ metric
I am trying to do a Wheeler-Regge analysis of a Morris-Thorne wormhole, but unfortunately, the Morris-Thorne wormhole is not Ricci-flat i.e. $R \neq 0$ where $R$ is the Ricci scalar, therefore, I am ...
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Vanishing throat of Morris-Thorne wormhole
Consider the Morris-Thorne wormhole given by (http://www.pas.rochester.edu/~tim/introframe/AmJPhysBlackHoles.pdf , Box 2)
$$ds^2 = -dt^2+dl^2+(l^2+b_0^2)(d\theta^2+\sin^2\theta d\phi^2)$$ where $b_0$ ...
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Black Hole limit from Morris-Thorne wormhole
I have to show that Morris-Thorne wormhole given by the metric
$$ds^2=-e^{2 \Phi}dt^2+\frac{1}{1-\frac{b}{r}}dr+r^2(d \theta^2+\sin^2 \theta
\ d \varphi^2)$$
has a black hole limit (or maybe flat or ...
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How close are we to making a wormhole? [closed]
Is humanity nearing the ability to construct a stable wormhole?
It's been something that was depicted for a while in various science-fiction shows; but are we getting close?
Do quantum computers ...
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Where is the wormhole in a Schwarzschild geometry?
I am new on wormholes and in my understanding, an interpretation of a wormhole connecting two "universes" can be obtained by doing coordinate transformations on the Schwarzschild metric.
I ...
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Crossing a Kerr wormhole
You cannot cross an Einstein Rosen Bridge because it needs faster than light speed to cross it. But the same is not true for a Kerr wormhole, it lies beyond the Cauchy Horizon and you do not need FTL ...
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Would you feel the gravity of a black hole through a wormhole?
So, hypothetically, if we were to "accidently" open a Einstein-Rosen bridge and the other side of the wormhole opened with in the gravity well of a blackhole. Would the gravity, and effects ...
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Black Hole Singularity Other Universe
It is thought that there is another universe beyond the singularities of black holes. Is it because width of the light cones become zero at the singularity, meaning that you can cross infinite ...
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Wormhole other end [duplicate]
How do we know what lies at the other end of a wormhole (another universe, a place 50 miles away, a place very far away) from its metric equation? Why is it said that there lies another universe at ...
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Other Side of an Einstein Rosen Bridge
We get an ERB when we replace $u^2$ by $r - 2M$ in Schwartzchild Metric, therefore the metric becomes symmetric along the horizon $(r = 2M)$. Why should it mean that crossing the horizon leads you to ...
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Crossing an Einstein-Rosen Bridge (ERB)
In order to derive ERB from Schwartzchild Metric, we replace $(r - 2M)$ by $u^2$ - which means after you cross the horizon the metric becomes the same as it was before the horizon. That means you ...
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What happens when a wormhole mouth moves over a smaller object?
This is really lots of questions in one, but I'll start by expanding on the title. Say that we have an infinite, euclidian universe (4d spacetime) with nothing in it but a single object (1m diameter ...
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Is it scientifically possible that “DNA can open wormholes” as suggested by an article in a mainstream & reputed journal?
I am attaching the links of two articles:
Mathematic model for vibration behaviour analysis of DNA
DNA Phantom Effect
In the introduction section of the first article it mentions that Poponin tried ...
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How does one calculate the tidal force in the throat of a wormhole?
If you were to attempt to open a wormhole from Earth to Alpha Centauri (4.37 LY), and its throat were to be a radius of 1m, while its mouth were to be 1.5m radius, how many newtons of force would be ...
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Deriving Einstein-Rosen Bridge
I know that an einstein rosen bridge is derived by a coordinate transformation on the schwarzschild metric, but I can't find much on it online, could someone please show how to change the metric into ...
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Is a wormhole detour in spacetime really shorter in distance or time than a straight line?
In this question I am coming from a mathematical perspective. Apologies if this question has already been answered in layman's terms. But here I am trying to understand the issues in mathematical ...
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Visualizing wormholes without embedding spacetime
Common visualization
Wormholes are often "explained" by a visualization like this where spacetime is reduced to two spatial dimensions:
(Source)
The problem with this visualization
Now I ...
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