welcome! I'm glad at least one of my answer was useful to you.
but after explaining your motives, I'd like to add some stuff:
1. i don't exactly know what you mean by
"a faster than Light first expansion rate, to then slow down, And Later accelerate again. In the universes life time". but the first thing that comes to my mind is "Inflation Theory".
this theory, which is now a part of Standard Model, explains the homogeneity of universe (which is so unexpected) by saying that just after big bang an Inflation which lasted 10^-36 Seconds caused that tiny spot to expand to almost the size that our universe now is!
well, as the Inflation lasted just a tiny fraction of second, i think this will be the point it
slows down, and then dark energy causes a new, rather much slower, expansion until now.
2. i believe regardless of red shift affect, we wont lose their light even if they move away faster than light!
let me explain: if you sit in a car which is moving 20m/s, and throw a stone with 5m/s (in the same direction), the speed of the stone will be 25m/s. and 15m/s if you throw it in the opposite direction.
if i got you right, you mean as the galaxies get away with speed of light, then there would be no light coming to us.
what happened to the stone, would never be true about light, because the speed of light is always a constant, and would never change due to the speed of light source or the observer.
3. i didn't say expansion was always constant at one speed, there was no "one speed" for whole universe at any time. because the speed varies with distance.
i can't say what the "why?" you wrote applies to, but if it says "why expansion was not always at one speed?", i repeat: because it varies with distance. and as the whole universe becomes bigger, and the distances increase, the speed of expansion increases too, in other words it accelerates.
Sorry if i got any of your questions wrong again, i did my best to comprehend.
and last time, a question came to my mind, I'll ask it again:
is it possible for the visible light to be red-shifted out of visible band of spectrum? shift into Infra-Red for instance?
welcome! I'm glad at least one of my answer was useful to you.
but after explaining your motives, I'd like to add some stuff:
1. i don't exactly know what you mean by [i]"a faster than Light first expansion rate, to then slow down, And Later accelerate again. In the universes life time"[/i]. but the first thing that comes to my mind is "Inflation Theory".
this theory, which is now a part of Standard Model, explains the homogeneity of universe (which is so unexpected) by saying that just after big bang an Inflation which lasted 10^-36 Seconds caused that tiny spot to expand to almost the size that our universe now is!
well, as the Inflation lasted just a tiny fraction of second, i think this will be the point it [i]slows down[/i], and then dark energy causes a new, rather much slower, expansion until now.
2. i believe regardless of red shift affect, we wont lose their light even if they move away faster than light!
let me explain: if you sit in a car which is moving 20m/s, and throw a stone with 5m/s (in the same direction), the speed of the stone will be 25m/s. and 15m/s if you throw it in the opposite direction.
if i got you right, you mean as the galaxies get away with speed of light, then there would be no light coming to us.
what happened to the stone, would never be true about light, because the speed of light is always a constant, and would never change due to the speed of light source or the observer.
3. i didn't say expansion was always constant at one speed, there was no "one speed" for whole universe at any time. because the speed varies with distance.
i can't say what the "why?" you wrote applies to, but if it says "why expansion was not always at one speed?", i repeat: because it varies with distance. and as the whole universe becomes bigger, and the distances increase, the speed of expansion increases too, in other words it accelerates.
Sorry if i got any of your questions wrong again, i did my best to comprehend. :wink:
and last time, a question came to my mind, I'll ask it again:
is it possible for the visible light to be red-shifted out of visible band of spectrum? shift into Infra-Red for instance?