The Universe is now 4D officially? Really?

siu77
siu77
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Topic 213123
DanNeely
DanNeely
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I'm 99% sure that

I'm 99% sure that " D=3+1 spacetime dimensions" is the normal 3 space and 1 of time.

Additional non-expanded space/time dimensions are a characteristic of string/membrane theory.

Shawn Kwang
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DanNeely wrote:I'm 99% sure

DanNeely wrote:

I'm 99% sure that " D=3+1 spacetime dimensions" is the normal 3 space and 1 of time.

Additional non-expanded space/time dimensions are a characteristic of string/membrane theory.

You are correct. Our macroscopic world that we experience is 3 space and 1 time dimension. And can be expressed functionally a 4-dimensional mathematical construct. Theorists like to expand the number of spacetime dimensions to suit their theories. 

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