Could there be universes with 2d time?

Answer 1

There are some theories regarding black holes that suggest a symmetry exchange between time and space, and momentum and energy, so that the normal 3D-1T in our universe becomes 1D-3T inside black holes relative to us, as well as 3p-1E becoming 1p-3E. This is just one example. There is no logical disproof of existence of worlds with more than 1 time axis, nor there is any logical disproof of existence of worlds with no time at all. It just seems very improbable and difficult for many to comprehend, but having a more flexible understanding of exactly what is time is necessary in order to make sense out of mulitverse theories. In our own universe, while "ordinary" spacetime has just 1 time axis, physicists generally agree that ordinary spacetime doens't even begin to cover what's going on in sub-Planckian dimensions, and so it's quite possible that there's a very different sense of "time" occurring at those scales, truly indpendent of the time axis we're familiar with.

Answer 2

I think it depends on exactly what you mean. If you mean a universe similar to ours but with a 5th dimension, and that dimension being another time dimension, I highly doubt it. This would mean there are the three spatial dimensions like our universe but instead of having a just a 4th dimension and that one being time, there would be a 5th dimension and that being time as well. Unless the laws of physics are completely different in this universe, there would be paradoxes constantly and the two time dimensions could wind up collapsing on each other.

According to string theory there could be as many as 11 dimensions on our universe. However, 10 of those dimensions are spatial dimensions. While time may be heavily distorted in these extra dimensions, there is still only one time dimension. I'd almost think for there to be two time dimensions there would need to be two big bangs within the same spatial dimensions. That is hard to even comprehend.

Answer 3

2d time? Is this part of a "flat universe" theory?
Sometimes I think we're falling out of the space-time
continuum and back to a "flat earth" mentality.
(I'm a "conspiracy theorist" and cynic)
2d time - this bugs me (provokes my neophyte imagination).
We MUST accept that time exists differently to classic perception and conception (uni-“directional”) as either the 3rd or 4th dimension in 3d or 4d space respectively. Special or General Relativity must be acknowledged and accounted for (else GPS would not work).
Relativity of simultaneity (the relativity of time) makes one aware that curvature of space-time IS affected by bodies within the universe which provokes examination and begs other possibilities.
Universes with 2d time? I'm not qualified to answer, however, discussions of time are interesting and my mind is open.
eg. http://home.pacbell.net/skeptica/time.html
P.S. Where did that CAT go?? Now I'm really confused.

Answer 4

What universe are you in?

Answer 5

Surely this could not be. As time MUST be in 4D

This really melts my brain these sort of things.