All Questions
39
questions
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. ...
- 323
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?
- 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 ...
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 ...
3
votes
1
answer
452
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.
- 2,908
2
votes
1
answer
125
views
Self-connected Einstein-Rosen wormhole
The Einstein-Rosen wormhole is described by the metric
$$ \begin{equation}
\mathrm{d} s^{2}=\frac{u^{2}}{u^{2}+2 m} \mathrm{d} t^{2}-4\left(u^{2}+2 m\right) \mathrm{d} u^{2}-\left(u^{2}+2 m\right)^...
- 546
5
votes
1
answer
236
views
Where does the singularity go in an Einstein-Rosen Bridge?
I've been reading up on some material about black holes and Einstein-Rosen bridges. Generally it is said that a black hole is defined by the event horizon (boundary in space where the gravitational ...
- 53
3
votes
1
answer
202
views
Penrose conformal diagram of Morris-Thorne wormhole
Consider the classical Morris-Thorne wormhole solution:
$$\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, ...
- 7,592
1
vote
1
answer
274
views
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 ...
2
votes
2
answers
157
views
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 ...
- 1,087
8
votes
3
answers
1k
views
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 ...
- 3,778
1
vote
1
answer
155
views
Lower limit to the distance between two mouths of a wormhole?
This is more like a conceptual question. Wormholes are tunnels connecting two different parts of the same universe or connecting two parts in different universes. Taking the former one as an example; ...
- 3,474
1
vote
1
answer
156
views
How can I "match" energy-momentum tensors in Einstein Field Equations?
I) CONTEXT:
When we study exotic solutions of Einstein Field Equations (EFE), such as Traversable Wormholes, the elementary modus operandi to extract some analysis is to deal with EFE in the following ...
- 3,085
1
vote
0
answers
154
views
Am I seeing a particle orbiting a Morris-Thorne Wormhole?
I tried to calculate the time-like geodesics of the Morris-Thorne Wormhole $[1]$, $[2]$, $[3]$ for redshift function $\Phi(r) = 0$ and $b(r) = \sqrt{r_{0} r}$. But I don't know for sure if all the ...
- 3,085
1
vote
1
answer
138
views
Doubt on Newman-Janis algorithm for a traversable Wormhole
Recently in a paper $[1]$ the researchers presented a rotating traversable wormhole solution using the famous Newman-Janis Algorithm $[2]$. But something is anoying me. In $[1]$ they presented the ...
- 3,085