Comparing Einstein's 4D Space-Time to a Fluid: Is it Possible?

  • Thread starter Thread starter delplace
  • Start date Start date
  • Tags Tags
    Fluid Space-time
delplace
Messages
64
Reaction score
0
is it possible to compare Einstein 4D space-time to a fluid ?
 
Physics news on Phys.org
maybe
 
A fluid is either a gas or liquid. Since gravity waves result in a transverse shear stress deformation to manifold, and not a pressure (normal stress); then in this respect, such manifold (spacetime) would seem more like a liquid fluid.
 
Okay, I'll be helpful: in certain cases it kind of acts like a fluid, but it's not. It's a geometry. If you could imagine a 3D grid of flexible metal bars which 'bows in' around mass-energy that's a good picture of spacetime.
 

Thread 'I don't see how a black hole's event horizon can be crossed'

OK, so this has bugged me for a while about the equivalence principle and the black hole information paradox. If black holes "evaporate" via Hawking radiation, then they cannot exist forever. So, from my external perspective, watching the person fall in, they slow down, freeze, and redshift to "nothing," but never cross the event horizon. Does the equivalence principle say my perspective is valid? If it does, is it possible that that person really never crossed the event horizon? The...
View full post »

Thread 'Question about Parallel Transport'

In this video I can see a person walking around lines of curvature on a sphere with an arrow strapped to his waist. His task is to keep the arrow pointed in the same direction How does he do this ? Does he use a reference point like the stars? (that only move very slowly) If that is how he keeps the arrow pointing in the same direction, is that equivalent to saying that he orients the arrow wrt the 3d space that the sphere is embedded in? So ,although one refers to intrinsic curvature...
View full post »

Thread 'Trying to calculate proper time of worldlines using rotating frames'

So, to calculate a proper time of a worldline in SR using an inertial frame is quite easy. But I struggled a bit using a "rotating frame metric" and now I'm not sure whether I'll do it right. Couls someone point me in the right direction? "What have you tried?" Well, trying to help truly absolute layppl with some variation of a "Circular Twin Paradox" not using an inertial frame of reference for whatevere reason. I thought it would be a bit of a challenge so I made a derivation or...
View full post »

Similar threads

B Is Einstein's Space-Time Theory Overfitted or Simply a Visualization Tool?
Replies
29
Views
3K
I The Universe filled with a "homogeneous perfect fluid"
Replies
30
Views
3K
B Is time an illusion?
Replies
5
Views
2K
A Relativistic Hydrodynamics Eqn for Perfect Fluid: Insight Needed
Replies
10
Views
2K
I Comparing Spacetime and Thermodynamic State Space Manifolds
Replies
16
Views
2K
I How is proper time visualized in the FLRW metric's 4D spacetime geometry?
Replies
6
Views
2K
B Is a Universe Without Mass and Energy Possible?
Replies
25
Views
4K
I What's the underlying frame of the Einstein's Field Equation?
4
Replies
186
Views
11K
I Negative Distance Metric: Elapsed Time & Space-Time Interval
Replies
14
Views
2K
I "Exploring Time Perception Across Different Regions of Space"
Replies
20
Views
2K

Hot Threads

Recent Insights

Back
Top