If the universe doubled in size, would it actually be any bigger?
Discuss the merits and deficiencies of political theories and philosophical questions.
| Announcements | Posted on | |
|---|---|---|
| Please change your TSR password | 23-05-2013 | |
| Enter our travel-writing competition for the chance to win a Nikon 1 J3 camera | 20-05-2013 | |
-
- Reputation:
- TSR Demigod
- Location: England
But then if spacetime is STRECHED, then the speed of light has also doubled
so we might not notice any extra relativistic effects..
if you do this,
gamma = 1/[1-(V^2/c^2)]
double V because V=x/t and x doubles
double c because light travels twice as fast (remember V only doubles if we STRECH space, if we just add another universe sized chunk onto the side none of this will change)
new gamma = 1/{1-[(2V)^2/(2c)^2]} = 1/[1-(4V^2/4c^2)] = 1/[1-(V^2/c^2)] = old gamma
so no effect (in special relativity)
I THINK!"
-
- Reputation:
- Overlord in Training
- Location: Under a small rock
- Posts: 3,336
If EVERYTHING was doubled it wouldt have changed, and it wouldt be diffrent.
Say your house was doubled, if the things inside were not then yes there would be a diffrence.
If your house AND all the things inside your house was doubled, it would not make a diffrence and you would not notice.
or somthing, i duno i just made that up
infinity x infinity = infinity -
- Reputation:
- TSR Royalty
- Location: UK and Canada
im going to modify your post...see if it makes sense :(Original post by BhArJ)
hmmm but infinity is never ending, how can you have somthing which never ends doubeld?
"hmmm but infinity is never ending, how can you have somthing which never ends"
pickler
-
- Reputation:
- Overlord in Training
- Location: Under a small rock
- Posts: 3,336
lol good point, but what about numbers? you can not have a end number, so its Infinite, isnt it?(Original post by technik)
im going to modify your post...see if it makes sense :
"hmmm but infinity is never ending, how can you have somthing which never ends"
pickler
-
- Reputation:
- Overlord in Training
- Posts: 2,011
Wasn't the thread about what would happen if the universe was doubled though, in which case it would be simply:(Original post by technik)
surely...
n x n = n² ?
n + n or n x 2, both of which = 2n, not n^2.
Given the fact that what you're trying to do equates to, basically, n+n (ie. infinity plus infinity), it must be impossible*, since you can't add to an infinite series.
(*assuming that the universe is infinite - I don't know about these things, but that seems to be what the clever-sounding physics people are saying!)
ZarathustraX -
- Reputation:
- Overlord in Training
- Posts: 2,011
Do you mean in the temporal or spatial sense? I think something could exist without an end in time, as long as it existed outside of time (ie. outside of our universe in which time applies). But then I guess that doesn't apply to the question at hand, unless you can argue that time applies within the universe but not to the universe as a whole. You probably can't argue that...(Original post by technik)
"hmmm but infinity is never ending, how can you have somthing which never ends"
pickler
*hoping someone more competent will pick up one of these threads*
ZarathustraX -
- Reputation:
- TSR Demigod
As yet no one had defined what they mean by bigger. The Universe has a finite amount of energy in it and if you doubled that, then the Universe would be larger than it is now. This would probably led to an open universe.
Until someone actuals defines what they are making bigger this question is completely nonsensical. -
- Reputation:
- Vengeful, Imperial Overlord of The Student Room
- Location: UK
So conclusion,
i) if the universe is infinite, then you are doing infinite+infinite = infinite. =>no change.
ii) if the universe is finite, consider that the universe is expanding and and we dont experience any changes => no change. -
- Reputation:
- Overlord in Training
- Posts: 2,011
If you "added another universe" in such a way as to make them both merge together into one, then you'd be back to "adding to infinity" (if the universe was already infinite), which leads back to my earlier point.(Original post by mik1a)
Like I first said it depends if you simply add another univrseon the side, or the current one is streched to double its volume.
If you "added another universe" in such a way that really all you had was two universes next to each other, then the universe wouldn't have doubled in size anyway.
ZarathustraX -
- Reputation:
- TSR Royalty
- Location: UK and Canada
i mean in a rational sense. where you cant have something that never ends. if it doesnt end it isnt a tangible "thing"(Original post by Zarathustra)
Do you mean in the temporal or extended sense? I think something could exist without an end in time, as long as it existed outside of time (ie. outside of our universe in which time applies). But then I guess that doesn't apply to the question at hand, unless you can argue that time applies within the universe but not to the universe as a whole. You probably can't argue that...
*hoping someone more competent will pick up one of these threads*
ZarathustraX -
- Reputation:
- TSR Demigod
Considering the fact the universe started off as a singularity in most theories, spatial dimensions are pretty meaningless. The universe is constantly expanding so in x time it will be so many time larger. What you surely want to change is the amount of energy the universe has and the way in which it expanded. (rate)(Original post by mik1a)
Like I first said it depends if you simply add another univrseon the side, or the current one is streched to double its volume.
