gan, I think you have the idea there. However, I'm not sure that anybody has considered a 0+1D universe, that is one consisting only of time. I'm not sure that such a universe could exist even theoretically. The lowest that I am aware of that anybody has worked with is a 1+1D universe. This has been used as a theoretical construct to test some ideas with. It makes the math much simpler to work with only one space dimension, and when they have that worked out they can then start generalizing to a higher dimensional space.

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.