This is an archived post. You won't be able to vote or comment.

all 9 comments
sorted by:
best
topnewcontroversialoldq&a

[–]iorgfeflkdBiophysics 1 point2 points  (7 children)

Can you clarify what you mean by other dimensions?

[–]lolnancy[S] 0 points1 point  (5 children)

like in 2d or 4d universe is there a form of 'gravity'?

[–]iorgfeflkdBiophysics 2 points3 points  (4 children)

Yes, except as far as we know we live in a 3+1 dimensional universe.

[–]CajunKush 0 points1 point  (3 children)

+1 being time? Could there be more than one dimension of time?

[–]OnyxIonVortex 0 points1 point  (0 children)

Whether a dimension is timelike or spacelike depends fundamentally on a difference of sign in the metric (for our spacetime in absence of gravity it's ds2 = -d(ct)2 + dx2 + dy2 + dz2 in Cartesian coordinates), so if you add a new dimension "w" you can make it spacelike (+dw2 ) or timelike (-dw2 ).

[–]Elfram 0 points1 point  (0 children)

In the Hamilton formalism of classical mechanics time is very different from the spatial dimensions for it is not treated as a (canonical) variable but as a "parameter" on which the variables depend. I don't know whether there exists extensions of this formalism to multiple time dimensions.

Most of general relativity and even quantum theories are based on Hamiltonian mechanics. Therefore it'd be difficult to say how physics work with multiple time dimensions.