How many dimensions are there?

Question

I saw these TV programs (we get smart TV programs in the UK) where they say there may be billions of dimensions (a la the Everett interpretation of quantum mechanics). Then they go on to say there are eleven dimensions. Are they talking about different things? Why does this confuse me?

Answer 1

Mathematically, using numerical analysis you can define any number of dimensions by calculating Eigen vectors, theoretically up to an infinite number of dimensions. Whether they are "real" or not is another question. We only know the four "real" dimensions we actually live in for sure -- heighth, width, depth, and time.

However, calculating and describing multi-dimensional space is absolutely critical to physics and understanding such things as string theory. Thus, there is an argument that, because the calculated multi-dimensional space accurately describes what is theorized, that multi-dimensional space may in fact be "real."

Answer 2

There is:
The Twilight Zone
Time Tunnel
Black Hole
Land Of The Lost
Quantum Leap
Journey To The Center Of The Earth
Dr Who

and the new
Reality TV shows....

Answer 3

Depends on different theories.

Space-time has 4 dimensions, 3 spacial, and 1 on time.
String theory and M-Theory have 10 - 11 or more.
Calabi-Yau manifold i think has 6 dimensions.

But generally, there is no set amount of dimensions, however so far there are 4 "confirmed" dimensions.

Answer 4

Current string theory allows up to 11 dimensions. After that, my eyes glaze over.

Answer 5

This is what I came up with.

Length
Width
Depth
Time
Electro magnetism
Supergravity
Quantum gravity
D-brane
NS5-brane
Calabi-Yau space
Joyce manifold

Answer 6

hmm... length, width, height, space, time. thats all i can think.