Space without time?

I think space and time are always present together.....
in SR,with a change in measured time,changes also take place in measurements taken in space....(I mean both are relative)

Space and time co-exist

 

Space and time are considered to be different dimensions of space-time, as far as everyday science goes. There might be some mathematical scenarios wherein one can exist without the other, but I don't think that it can occur in reality.

 

Space without Time = Time without Space.

And that's all I can say (bits of physics philosophy)

 

In a way, space-time is space without time.

 

Perhaps in a metaphysical sense - but not on these forums

 

I remembered I read somewhere that the dimension of time is the result of quantum fluctuation from a 4+0 dimensional space without time. :grumpy: I think it's mentioned in "Time Travel in Einstein's Universe: The Physical Possibilities of Travel Through Time" by J. Richard Gott.

 

Einstein equation certainly possesses solutions in which the metric has the signature (++++). In other words, it is possible that only spacelike (or only timelike) distances exist. In this sense, space without time or time without space are possible, at least theoretically.

 

There's no time in LQG. You have to make it up as you go along.
Seriously, with no time it's not possible to define change so the timeless universe just freezes and is of no interest (?)

 

Are you claiming that there are no changes in LQG and that LQG is of no interest? :rofl:

 

Certainly not. The two sentences should be taken separately. The first word of the second sentence implies that the line above should not be taken seriously.

I know that in LQG a quantity which always increases can be found, against which to compare other things to define change.

But I think some sort of 'time' is required to define change.

 

Mathematically -> 4 dimensions:3 spatial + 1 time(like).
Discard or neglect the time ,and what are you left with is...
Math has no problem with it.
But physics...

 

Note that the time axis in space-time is not the same thing as the measure of an observer's proper time.
Since an observer who applies a boost, which is a change to a diferent frame, is semi-rotated in space-time it follows that an observer's measure of time depends on the orientation towards the time axis.

 

If you really see from the point of view of a photon....travelling at c....it doesnt experience time

 

In my mind, time is the aether, while space is what we measure via EMR.

 

time at c

Do you consider that we can not synchronize clocks that move with c?:rofl:

 

time at c

Do you consider that we can not synchronize clocks that move with c?:rofl:

 

I would think that if I could hitch a ride on a photon everything would appear the same right down to our clocks, i.e.. There is nothing out there that says our visible universe could not be seen from "some" vantage point as a photon.