All Questions
24
questions
2
votes
0
answers
85
views
Could the universe be a 4-ball?
I recently thought of the idea that the universe could be an infinite 4-ball. The Big Bang would be its centre, and time would be outward from its centre (one layer would be one point in time). I ...
user334229
0
votes
1
answer
108
views
How could the concept of finite unbounded universe be compatible with the fact that there are 3 dimensions? Is the example of the balloon a bad one?
In cosmology, the current understanding is that the universe is finite while being unbounded.
To explain that, one often uses the example of the surface of a balloon: if we are on the surface of the ...
1
vote
3
answers
1k
views
Does quantum physics apply to other dimensions?
Does quantum physics apply to other dimensions? Common sense seems to dictate that in a universe with two dimensions, quantum physics wouldn't apply, because particles would be vastly different from ...
- 791
0
votes
1
answer
249
views
Is there such a thing as negative dimensions? [duplicate]
From what I understand so far, we live in a 3rd dimension, and we see in the third dimension. We can imagine both the third, second, first, and even the zeroth dimension with thought. However, the ...
- 21
0
votes
2
answers
77
views
Is there any way to prove that contrarly to a flat 3D space, a curved 3D space can only be constructed in a 4D manifold?
This question is a result of me trying to understand how this universe can be possibly infinite if it isn't infinitely old. So to compare with an area that is flat it can be constructed both in 2D and ...
- 2,255
0
votes
3
answers
228
views
Dimensions of Physical objects doesn't make sense [closed]
Can you show me a pure 1D or 2D object? A line and a plane have a thickness. A pure 1 D line is one with no width. But if its width is zero, it doesn't exist. Similarly, a 2D plane is perfectly ...
- 1,027
1
vote
1
answer
71
views
Is there a theory that proposes the universe is a spacetime bubble within a higher dimensional reality? [closed]
I have heard that one proposal/interpretation of string theory is that, perhaps, extra dimensions exist at minuscule scales. I would conjecture that it is possible for the opposite to be true, akin to ...
- 13
0
votes
1
answer
68
views
Dimension in the universe [closed]
I was researching on a project ,that is I have to prepare a lecture on 4d.While browseing in youtube I found myself in this question, 1st and 3rd dimensions have fundemental forces acting on objects ...
- 13
1
vote
0
answers
65
views
Why are we in 3 spatial dimensions? [duplicate]
I am very curious to find if there is any reason that why are we in 3 dimensions not in any other like 1D would be hard almost impossible but 2D could have been possible, or what about 4D or in ...
- 11
1
vote
1
answer
70
views
General question about dimensionality of the universe [duplicate]
I am a high school math teacher with some basic physic/lay person knowledge.
Each year after the AP test, I show the movies Flatland and Sphereland to my calculus classes and talk about the ...
- 11
-3
votes
1
answer
114
views
Is time really a 1-dimensional object that we only traverse through? [duplicate]
Is time really a 1-dimensional object that we traverse || is it possible that time can also be traversed horizontally. I think the later would also put it on a 2 dimensional plane.
- 197
2
votes
1
answer
92
views
For the case where universe is not flat, has it got an extrinsic curvature towards (an)other spatial dimension(s)? [duplicate]
I got the idea that expansion of the universe is not to somewhere, it is just getting stretched of spacetime since a point of singularity. And I know that universe was calculated as flat (which means ...
- 41
2
votes
1
answer
270
views
Why a 3D Universe?
The universe as it stands is perceived by us to be 3 dimensional. Why is it that the universe formed into 3D space and not 4D or 5D space for example?
- 197
-1
votes
2
answers
1k
views
Does the expansion of the Universe into a higher dimensional space imply that 4D objects are real?
It is my understanding that objects in the Universe are not just getting farther apart but space itself is expanding and so in some real sense, higher-dimensional geometry is "real" -- if so, on a ...
- 189
0
votes
0
answers
44
views
Higher dimension world possibility [duplicate]
Could it be possible that all of the unexplained phenomena (like uncertainty) in our 4D world might be originated from a higher dimension universe? If so, then of course we'll never observe the ...
- 53