Loop versus closed string?

  • #26
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Petm1

I see you have had a long discussion on 'time' over in the SR forum, and I took a look at that before going on here. In fact, I was thinking of coming back here, but not for speculations. You may know that idle speculation is frowned on here.

The SR forum discussion ended when Doc Al closed your thread, for what I consider to be good reasons. Further, this thread was about string vrs loop theory, in which I visited USCB and heard Gary Horowitz say that what is needed is a new physics, which he said requires a new view of the fundamental physical nature of time.

However the study of time is something that will require a new thread, in my opinion. It is likely to be a very difficult discussion, one in which ordinary language is part of the problem. I have been thinking of starting such a thread, but I will have to gather resources and lay down a groundwork first. I am not sure I am up to the task, now or ever, but certainly not now and not here.

Regards,

R.
 
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  • #27
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rtharbaugh1,

Thanks for your reply, I can see that when talking about time it is all speculation.
 
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  • #28
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petm1
Your statement is probably an over generalization. All physics is based on measurement. Time can be measured. We do not have to speculate about what time it is, we can look at a clock. We do not have to speculate about how much time it takes a jet at mach1 to travel one mile, it can be calculated. Perhaps we can make theories about time which can be tested against measurables.

This thread is about the difference between strings and closed loops. I started it with that title because I still don't really feel I have a good answer. Time came into the thread because Dr. Horowitz speculated that a common problem in both string and loop theory might only be resolvable with new physics, which in his estimation, as I understand it, will require a new view of time.

So the problem of time is one common to string and loop, not likely to help me understand the difference between string and loop.

I have begun to look for current work on the topic of time in arXiv, but so far it seems difficult to find search terms that produce relevant results. A search for "spacetime and geometry" results in hundreds of papers, most of which are too deeply specialized to be helpful to me.

I want to start a new thread on the topic of time but first I want to find at least one reference for a starting point. It seems to me the problem is that time is ubiquitous, and like gravity for Newton, it has remained an undefined observable.

Wiki has an artical giving reference, including one in Further Reading to Rovelli, Carlo (2006). What is time, what space?. Di Renzo Editore, Roma

http://en.wikipedia.org/wiki/Time

http://en.wikipedia.org/wiki/Spacetime

R
 
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