Skip to main content

Questions tagged [wormholes]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
4 votes
0 answers
59 views

Can wormhole inside a black hole become an escape?

I did not major in Physics so not sure if this is a proper question; but according to some Google search there do exist papers discussing wormhole inside black hole like this, which I am not able to ...
Luke Lee's user avatar
  • 141
2 votes
1 answer
68 views

Understanding Wormholes Geometrically

Is the folding sheet analogy really that good for understanding what a wormhole is? After all, space-time curvature doesn't require any ambient space (it's intrinsic), as such a picture would suggest. ...
user345249's user avatar
1 vote
0 answers
25 views

Would a Wormhole exclude the creation of another wormhole in the warped space?

In this typical depiction of a wormhole, spacetime is folded to make the two distant areas closer together. Would that mean the "crest" of the "fold" in spacetime is incapable of ...
Ben Warner's user avatar
3 votes
0 answers
51 views

Replica wormholes in $AdS_5 \times S^5$ holography

I have a question about replica wormholes and the CFT ensembles in AdS/CFT. To make sure that my question isn't coming from a simple misunderstanding, I'll first sketch out my current understanding on ...
11zaq's user avatar
  • 1,014
0 votes
1 answer
67 views

What’s the condition to form an astrophysical wormhole?

According to GR, what’s the mechanism for a star to form a wormhole? How is it different from collapsing to a black hole? What’s the energy scale required?
user74750's user avatar
  • 195
1 vote
1 answer
97 views

Limit of gravity

Is there any limit to the bending of spacetime due to gravity? I have been reading about wormholes and how they bend spacetime and connect two systems. But if there is no limit to gravity, we can ...
Surajsing Rajput's user avatar
0 votes
0 answers
20 views

What modifications/corrections are made by $f(R)$ gravity model on Morris-Thorne wormhole metric?

What modifications/corrections are made by the $f(R)$ gravity model on the Morris-Thorne wormhole metric? Specifically, how does the physics associated with the metric change in $f(R)$ gravity compare ...
PARTHA PRATIM NATH's user avatar
0 votes
0 answers
14 views

MP and RN Spacetime in Intra-Universe Wormhole Metric

I want to make sure I correctly understand what this paper is saying. It sounds like it is talking about a two-body Majumdar-Papapetrau outer metric that switches to RN once you enter either of the ...
user345249's user avatar
4 votes
0 answers
111 views

Precise formulation of the ER = EPR conjecture

Maldacena and Susskind have "formulated" the now famous ER = EPR conjecture in their paper Cool horizons for entangled black holes, but as of today, I have not find a quantum theorist who ...
THC's user avatar
  • 355
0 votes
2 answers
78 views

Negative Energy and Gravity

Why do many science communicators say that negative masses fall upwards? Is it the same in the physics literature that they say that negative masses fall upwards? In general relativity, things don't ...
CinemaClips's user avatar
8 votes
1 answer
565 views

Could information be transferred through a wormhole?

There was a paper published recently about the possibility of sending messages through a wormhole,see reference here. It has also been speculated that any entangled pair of particles—even particles ...
Cristian Dumitrescu's user avatar
-2 votes
1 answer
88 views

Will this hypothetical circular singularity FTL travel warp drive work? [closed]

Not a physicist, but just wanted to know if this would work in theory: Since nothing can practically travel faster than the speed of light (for now until proven otherwise), the only way for ...
notorious-raccoon's user avatar
1 vote
2 answers
134 views

Do certain quasi-particles really have negative mass?

Do phonons for example really have negative mass or does it just seem like they have negative mass? Could one use the negative mass of certain quasi particles to meet the negative energy requirements ...
Peter's user avatar
  • 135
1 vote
2 answers
141 views

Is an Einstein-Rosen Bridge theoretically required to have matching Schwarzchild radii on either end?

Is there a solution where the mouths on either end can have a different radius? I am also curious about these types of requirements in the case of a multi-mouth wormhole. Thanks for your time.
Shedbot's user avatar
  • 109
1 vote
1 answer
196 views

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. ...
Peter's user avatar
  • 135
3 votes
0 answers
64 views

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 ...
2 votes
0 answers
254 views

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 ...
DimensionDestroyer's user avatar
3 votes
2 answers
244 views

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 ...
Hokon's user avatar
  • 360
3 votes
1 answer
437 views

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.
blademan9999's user avatar
  • 2,908
2 votes
1 answer
124 views

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)^...
David Shaw's user avatar
1 vote
2 answers
366 views

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 ...
Robert's user avatar
  • 79
0 votes
1 answer
266 views

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 ...
Bastam Tajik's user avatar
  • 1,272
1 vote
2 answers
132 views

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) ...
Matheus Henrique Sousa Macedo's user avatar
5 votes
1 answer
233 views

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 ...
Matthias K.'s user avatar
1 vote
0 answers
50 views

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 ...
user98816's user avatar
  • 121
2 votes
1 answer
144 views

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 ...
daniel.sedlacek's user avatar
-1 votes
1 answer
86 views

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 ...
Jerome Wang's user avatar
7 votes
1 answer
880 views

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 $AdS_2$ ...
peep's user avatar
  • 773
1 vote
1 answer
212 views

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, ...
user avatar
1 vote
1 answer
185 views

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 (...
Daemonsoadfan's user avatar
1 vote
1 answer
66 views

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 ...
R. Rankin's user avatar
  • 2,847
0 votes
0 answers
71 views

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 ...
R. Rankin's user avatar
  • 2,847
5 votes
0 answers
81 views

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 ...
Rexcirus's user avatar
  • 4,963
1 vote
1 answer
113 views

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: ...
Alex Martian's user avatar
0 votes
1 answer
123 views

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 ...
user avatar
2 votes
0 answers
200 views

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 ...
user avatar
4 votes
4 answers
966 views

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 ...
user avatar
3 votes
1 answer
201 views

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, ...
Cham's user avatar
  • 7,592
0 votes
1 answer
54 views

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 ...
Soda Party's user avatar
0 votes
0 answers
93 views

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\...
user345249's user avatar
2 votes
1 answer
163 views

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 ...
Rol's user avatar
  • 849
2 votes
0 answers
43 views

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 ...
MatterGauge's user avatar
1 vote
0 answers
39 views

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 ...
Ben Warner's user avatar
1 vote
1 answer
101 views

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 ...
user6760's user avatar
  • 13k
1 vote
1 answer
159 views

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 ...
Joseph Hirsch's user avatar
1 vote
0 answers
96 views

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 ...
aygx's user avatar
  • 385
1 vote
1 answer
105 views

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 ...
Dr. user44690's user avatar
3 votes
1 answer
166 views

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 $b_0$ ...
Dr. user44690's user avatar
1 vote
0 answers
81 views

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 ...
albert rammstein's user avatar
0 votes
1 answer
109 views

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 ...
Anonymous's user avatar

1
2 3 4 5 6