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Grex Science Item 93: Four dimentional universe?
Entered by goxer on Tue Sep 9 09:59:07 UTC 2003:

Minkowski's four dimentional universe?
Is it real.Can we prove that the 4th dimention is the time.Is it a variable?
According to the special theory of relativity it is but this theoy isn't
prooved.Suggest how to prove this.

8 responses total.

#1 of 8 by rcurl on Tue Sep 9 14:41:09 2003:

What do you mean by "isn't prooved [sic]"? The Special Theory agrees with
observations (that do not invoke gravity).

#2 of 8 by goxer on Wed Sep 10 16:04:53 2003:

I didn't include gravitation but curved space-time which is a part of the
special theory of relativitty

#3 of 8 by rcurl on Wed Sep 10 16:07:44 2003:

So, what part of Special Relativety is not supported ("proven") by
observations?

#4 of 8 by cyberpnk on Fri Sep 12 19:31:47 2003:

According to Michio Kaku's book Hyperspace, the exact number of 
dimensions is ten.

#5 of 8 by marcin on Sat Feb 7 12:52:10 2004:

time is a 4th dimension of universe, Einstein proved this, Stephen Hawking
didn't .

#6 of 8 by rcurl on Sat Feb 7 20:28:02 2004:

Time as a dimension goes way back before Einstein.

#7 of 8 by gull on Sun Feb 8 19:32:55 2004:

Isn't whether time is considered a "dimension" or not simply a question 
of definitions?

#8 of 8 by rcurl on Sun Feb 8 20:37:47 2004:

A "dimension" is a quantity in which something (anything) is measured -
at least to physicists. What it comes down to, though, is that when someone
says that the universe is "four dimensional", THEY should say what they mean,
so yes, it is very much involved with definitions.

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