N

#### nightcleaner

I have been thinking that this has to do with the fact that location is purely spatial, while momentum adds the concept of continuation in time. We generally imagine that there are three dimensions in space and only one in time, but Einstein thought that space and time are really the same thing, so we have four dimensions of spacetime. Then, I imagine, when we choose which of the three dimensions to specify as to position, the remaining one is the time dimension. However, any of the four can be time, so long as the other three are specified as position. So, the result of an event in "time", as we look backward at what has already occurred, depends on which of the four available dimensions happened to be taken up by the space determination.

In any event, then, there are several ways in which a determination (measurement) can be made. If we can arbitrarily call the four dimensions of spacetime something like A, B, C, and D, how many combinations of space and time are possible for any one observation? We could have As Bs Cs and Dt, or As Bs Ct and Ds, and so on. If we keep the sequence ABCD, we could just say that the options are such as ssst, ssts, as shown above, and then stss, and tsss. In other words there may be four time-like options for any observed event.

Another way to look at HUP is that if we choose an extremely short time interval, we can say very exactly where an object is located, but if we choose a longer time interval, the object has enough time to squirm around a little, so we can not say as exactly where it is located. After all, over a long enough period of time, an object may occupy many different positions.

I find it interesting, altho I still do not understand it, that the scientist Max Planck was able to specify a least possible amount of time and a least possible amount of space, and these are now known as the Planck length and the Planck time, and are given rather precise values. A Planck time is something like 10 to the minus 43 seconds, and a Planck length is something like 10 to the minus 27 meters, if my memory fails me. The two quantities are related to each other by the speed of light, so that a Planck time is the time it takes light in a vacuum to cross a Planck length.

Then, I think, we may talk about a four dimensional spacetime in which minimal events occur. An object can only progress through this four dimensional spacetime in increments of one Planck length and one Planck time. This is not space and time as we know it, where objects usually experience huge amounts of Planck time for every Planck space traversed. One Planck space for one Planck time would be the speed of light, you know, and our percieved world operates at velocities far below that.

Well, to get back to the question, zero point energy, are we talking about zero time or zero space or both? If zero time, there can be no energy, because energy has to do with motion, which requires time for its existance. If zero space, there isn't enough room in there for anything to happen, so again, no energy. But if we are talking about a four dimensional zero, then we have to reconsider what we mean by time and space as I discussed above.

We do know that we exist, or at least it is necessary to suppose that we exist, and it seems reasonable to suppose that the world we experience exists in some sense also. And things seem to happen, so we may suppose that there is some potential for change to occur, and this potential must exist down to the very least elements of space and time as we know them. In fact, Planck units are sometimes spoken of as action potentials. But I think if we are to realize four dimensions, we have to carefully examine our idea of what action, or change, really is.

But this epistle has gone long, and by now I am probably talking to myself again, a bad habit of night cleaners, one which causes daytime observers to look askance. I will just say that these ideas have lead me through the many worlds hypothesis into the many times hypothesis, and our world looks very different to me now. I am open to discussion, if anyone is interested.

thanks,

nc