What does 3-dimensional space deform into, in the presence of gravity?

In summary, the conversation discusses the visualization of space and how it can be represented in different dimensions. It also mentions the idea of space deforming into higher dimensions, but the validity of this concept is questioned. The conversation also brings up the use and reliability of pop science sources, particularly in regards to the work of Brian Greene.
  • #1
jaketodd
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I have no expertise in this area, other than rudimentary concepts. The following might apply if the visualization of space, as depicted below, represents actual reality, but I don't know for sure. Please help me understand better, you guys!

2-dimensional space
The curvatures deform into the 3rd dimension, as can be seen in the picture below.

So in 3-dimensional space, what does space deform into? 4th!?
We can't even visualize it! Unless it doesn't deform into the 4th, but instead just stretches space, without a deformation into a 4th. See another picture below.

This is mentioned by Brian Greene, notable for his documentary The Elegant Universe. He's mostly about string theory but poses this question as well.

https://en.wikipedia.org/wiki/Curved_space

1687711776058.png


1687711851246.png
 
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  • #2
jaketodd said:
2-dimensional space
The curvatures deform into the 3rd dimension
No, they don't. The third dimension in the picture has no relationship to any dimension in reality. A curved space doesn't deform "into" anything. The curvature is intrinsic.

jaketodd said:
So in 3-dimensional space, what does space deform into?
Nothing. See above.

jaketodd said:
This is mentioned by Brian Greene, notable for his documentary The Elegant Universe.
This is a pop science source and is not a valid reference. In fact, Greene's pop science books and videos are particularly bad because of the number of misunderstandings they create among unsuspecting lay people. We have had many past PF threads on this.
 
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  • #3
@jaketodd, you apparently have failed to take my advice to learn from textbooks and peer-reviewed papers instead of pop science sources. You really, really, really, really need to take it.
 
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  • #4
The OP is based on a misconception obtained from an invalid pop science reference. Thread closed.
 

FAQ: What does 3-dimensional space deform into, in the presence of gravity?

What does 3-dimensional space deform into in the presence of gravity?

In the presence of gravity, 3-dimensional space deforms into a curved geometry as described by General Relativity. This curvature is a result of mass and energy warping spacetime, leading to the gravitational effects we observe.

How does General Relativity describe the deformation of space due to gravity?

General Relativity describes the deformation of space due to gravity using Einstein's field equations. These equations relate the distribution of mass and energy to the curvature of spacetime, which dictates how objects move within that curved space.

Can we visualize the deformation of 3-dimensional space caused by gravity?

Visualizing the deformation of 3-dimensional space can be challenging because we are trying to represent a higher-dimensional concept. However, a common analogy is the 2-dimensional surface of a rubber sheet being distorted by a heavy object, which helps illustrate how mass can curve space.

What role does the curvature of space play in the motion of objects?

The curvature of space dictates the paths that objects follow, known as geodesics. In a curved spacetime, objects in free fall move along these geodesics, which appear as curved trajectories when viewed in the context of flat, Euclidean space.

How do black holes illustrate the deformation of 3-dimensional space?

Black holes are extreme examples of spacetime curvature. Near a black hole, the curvature becomes so intense that it creates an event horizon, beyond which not even light can escape. This illustrates how massive objects can significantly warp the fabric of space and time.

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