Spacetime

[Deepwater6]

If the space between galaxies is expanding does that mean time continues to move quicker in these areas? Ever increasing as Dark energy continues to expand at faster and faster rates? Or is "spacetime" a realm unto itself regardless of expansion? A never changing Pace.

[sigurdV]

If the space between galaxies is expanding does that mean time continues to move quicker in these areas? Ever increasing as Dark energy continues to expand at faster and faster rates? Or is "spacetime" a realm unto itself regardless of expansion? A never changing Pace.

An interesting question! I guess it wont take too long before you get some authorative answers, meanwhile I can only guess and Id say that time in expanding space moves faster and faster as a cause of diminished gravitational forces, but with some natural limit to it.

[Rade]

Hello Deepwater6....you will want to read the book below by C.J. Masreliez, where the argument is made that spacetime is constantly expanding, always has been, always will be, thus no need for a Big Bang cause. I like this thinking because both space of universe (e.g., the inner most boundary of it as a thing that contains) and time (as number that measures motion), are infinite and by definition, that which is infinite can always have something added to it without end.

http://www.estfound.org/downloads/thebook.pdf

 

But, one correction I would make to your question, plus wording in the book by Masreliez...for me, time is not FAST or SLOW, time is LONG (MANY)or SHORT (FEW). Also, time does not move, entities move, time is nothing more than a number that is the measure of motion of entities (and thus indirectly,rest). I discuss my opinion on this in the thread by SiguardV about clocks and his twin paradox experiment.

 

Concerning book of Masreliez, on p. 19 he makes statement.."when space expands the length of second also must expand, i.e. time must slow down". This is not my view. I would say, i.e., the number of time must be shorter. Why ? Let |__| be the length of a second, and this many seconds between two moments (M) of fixed scale, M1|__||__||__||__|M2. Now, as per suggestion of Masreliez, let space expand such that length of second also expands, thus new expanded second looks like this |______| and new relationship of time to the two moments that maintains scale becomes M1|______||______|M2. So, do we conclude that time must slow down ? No, we say that after space expansion, the number of time as measure of motion must be shorter or fewer...that is, it is now 2, instead of initial 4.

[Aethelwulf]

If the space between galaxies is expanding does that mean time continues to move quicker in these areas? Ever increasing as Dark energy continues to expand at faster and faster rates? Or is "spacetime" a realm unto itself regardless of expansion? A never changing Pace.

 

I am not sure of the answer. Two might be:

 

Yes, time is wobby in spacetime, the faster a galaxy goes then their time relative to us will be dilated.

 

or

 

No, because it is the vacuum which drags galaxies globally. Just like how the most distant of galaxies are not actually receding faster than light but instead the vacuum is creating the illusion that galaxies are moving faster than light.

[JMJones0424]

I'm not sure if this answers the question directly, but time dilation due to spacetime expansion can be observed by looking at the time it takes distant type Ia supernova to evolve. I'm not sure I'd say that "time continues to move quicker" though. Time dilation in this case is a function of relative speed, not a property of spacetime.

[Rade]

I'm not sure if this answers the question directly, but time dilation due to spacetime expansion can be observed by looking at the time it takes distant type Ia supernova to evolve. I'm not sure I'd say that "time continues to move quicker" though. Time dilation in this case is a function of relative speed, not a property of spacetime.

Thanks for great link that will be fun to read in detail. I agree with you that time does not 'move quicker'. As you say, time dilation refers to longer or shorter relative to speed of some entity, an observable, time itself is not faster of slower. Why do so many people, including physicists, get this simple concept of time so confused, any explanation ?

[Deepwater6]

Thanks for the explanation guys. I'll have to chew on this a while. I agree Rade "time" is very misunderstood by many. Considering all the aspects of it can be elusive to some, myself included.