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Old 04-20-2009   #14 (permalink)
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Re: What is "spacetime" really?

Quote:
Originally Posted by Pyrotex View Post
Quote:
Originally Posted by Michael Mooney View Post
...And then you keep saying "Time is what clocks measure." ...
With the same logic we can say that "Auras are what aurameters measure" or "Ley lines of force are what specially tuned dowsing rods measure."

Get my point? Ontologically none of the above establishes the "reality" of time as a dilating (etc.) medium... or "bioplasmic energy" or "ley line earth forces" as "real."...
AHA!!!

You have asked a really, really intelligent and challenging question here!

I love the analogy between "time" and "ley lines".
I like it too. I think it was originally brought up in post #137
Quote:
Originally Posted by modest View Post
Think of the magnetic field lines a person could draw around a magnet. The field lines are not real physical things. But, that doesn't mean electromagnetism isn't a real physical thing. It doesn't mean that Maxwell's theory of the electromagnetic field is wrong.
One might be tempted to say that magnetic field lines are not real and not physical but are rather something like a map and therefore magnetic field lines must be straight (they cannot be curved). This is analogous to saying the spacetime manifold is not real and not physical but is itself a map and therefore it must be straight and uncurved (i.e. space and time cannot be curved).

As I've previously said, that line of reasoning does not seem sound to me.

~modest


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