Time Dimensions

What the heck does this mean? Well, it turns out that there can be more than one time dimension. How many is a good question. Let's go with two, and we'll call it two-timing dimensions.

Ha, you say! Think about it this way. With only two points on a string, you only have one path between, but with two time dimensions, which way do you go? Actually, the points on the string could be connected with several paths and some of these could loop back upon themselves. What does that mean? That means you could go back in time.

There is a lot of confusion about how many space dimensions and time dimensions one can have. One thing is possible is that a particle in 6-dimension space can have more than one shadow in our 4-dimension space. That means that the particle would have two different phenomena. If all of this sounds crazy, it is, but sometimes these crazy theories can predict things, and one of the predictions is the possibility of traveling into the past.

Another possibility is that the speed of light is faster in some of these additional dimensions, and that would suggest that faster than light travel is possible. Maybe this is how a tachyon particle works. Tachyon particles are theoretical but they never drop below light speed. It's possible that tachyon particles exist in higher dimensions where the speed of light is faster.

Itzhak Bars at the University of Southern California expanded this idea when he proposed that the Standard model is a shadow of 6-dimension theory, just like a 2-dimensional shadow of a 3-dimensional object can vary depending on where the light source is placed. Thus objects in Bar's two-time physics theory can have multiple shadows in the 4-dimensional universe that we're in.

When applied to supersymmetry, Bar's idea it leads to many interesting possibilities in which there are 13 dimensions, 11 space dimensions and 2 time dimensions. However, this is only one interpretation. There are many possibilities of multiple time dimensions
Wave equations are a way to deal with extra dimensions.

Wave equations can be expressed in ultrahyperbolic equations, which involve partial differential equations. Here's an example.

Most wave equations involve a time variable t and spatial variables. A scalar wave equation in one space dimension is:

where u is a scalar function as:
u = u (x1, x2, ..., xn; t)

Actually, special relativity allows for many time dimensions because spacetime is a manifold whose metric tensor has a negative eigenvalue, which suggests many time-like directions. In effect one can propose n-like dimensional spaces and k-like time-directions. Usually, the math works out to show that these spacetimes have one space dimension and 2-time dimensions. Again, no one has taken this to a conclusion.

But, nevertheless, this idea of extra time dimensions has merit and could open up a way to go back in time. It shows that the concept of time is inherently more complicated than we thought.

Thanks for reading.