ThinkingAtoms

I haven't heard of this before. Do you have any references / links to more about it?

https://physics.aps.org/story/v27/st10

http://www.buffalo.edu/ubreporter/archive/2011_04_28/one_dimensional_universe

It is hard to find to much about it that isn't behind pay walls.

Since the 4th dimension is time, a 4D sphere is a sphere moving.

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And not even.

A 3D sphere simply existing is a 4D object. No motion required.

i mean 4d of space and 1d of time.

In a nutshell it says that in a super high energy system, like lets say right after the "big bang", lower level dimensions would of been possible. even if for a small amount of time. This is how i got to the idea if we had a dimension of 0 with infinite energy that move into 1d of space and 1d of time, it would decay into a 3d universe.

 

I am not familiar with it.

do you have any idea or guess as to what a 4d plane would look like to us? we will say a 4d sphere or would it just be indistinguishable from a 3d sphere to us?

We are 3d beings in a 3d datum universe - we would see the 3d cross-section of the 4d object. For instance (and dropping dimensions by one) if a 2d being was to look at a 3d object in his 2d universe; a cone would appear as either a circle, an elipse, a parabola or a hyperbola, or a point - it would slowly moved from one to the other as the object moved. There is probably a simulation of what a tesseract would look like in 3d on the internet - rendered in, of course, a 2d video

It is argued that only a universe with 3 spatial and one temporal dimension can be stable:

https://en.wikipedia.org/wiki/Anthropic_principle#Spacetime

Thank you for this info I hadn't come across something like this, Please ignore previous statements.

I don't really understand what you are saying. The universe exists it has four (space-time) dimensions, and always has had.

 

There is no evidence that the universe "started" (and, even if it did, no evidence of how).

Doesn't the CBR (Cosmic background radiation) show that the universe had to have some kind of start?

Also what do you have to say to the "vanishing dimensions" concept that has been floating around

because to have space and time means there are dimensions...

No i meant why dose there need to be space-time in the first place, from my understanding of Special relativity, Space-time only exist because the fact that dimensions exist, so why would you NEED space time at all. Wouldn't it just start when the universe went from 0 to 1 or more dimensions? Or are you stating that because in a 0 dimensional space with out space-time nothing could happen? In which case what is your view on how the universe started?

 

In a universe with 0 dimensions, there can be no time or space. Therefore no universe.

There doesn't need to be unless you can show me a reason there dose have to be.

In a universe with 0 dimentions the speed of causality can be infinite. with infinite "time" anything can happen

What would one expect to see if they were inside of a 3D object that was slowly turning into a 4D object? This is a little broad I am aware. But to be honest I wasn't really sure where to start on this one. The reason I want to put this out there is that the more I grasp some of the theoretical side of science and the maths, I'm starting to see a trend to the possible max speed of causality and the number of dimensions. This brought me to what if Dark energy is an energy that slow's Causality by increasing the dimension count. Please let me know how wrong I am but remember the original point of the thread.