A physics question.

[navyplaya]

Alright well I have been pondering about this for the past few days.

 

 

 

According to many popular physicists and space theorists:

 

1. T=0 at the big bang.

 

2. Space does not stop in the singularities of a black hole.

 

 

 

So, if t=0 at the big bang, and time does not stop in singularities, then by saying that t=0 in the big bang, they are saying that there is only one universe right? Or are they saying that each universe has its own time. If they are saying that time was created at the big bang, then they are saying this is the only universe, unless each universe is in its own time. Because if time does not stop in a singularity, then time would exist before the big bang and therefore t would not =0 at the big bang right? Also, if each universe has its own time, could the properties of time be different for each universe?

 

 

 

Just a few questions I've been wondering, any thoughts?

[assassin_696]

Depends which theorem you look at, so i'll explain the one that I know best about.

 

 

 

Stephen Hawking worked on what's called a no-boundary theorem for the Universe. He basically said that the Universe is a bit like the surface of the Earth, except three-dimensional. The singularity is represented at the north pole, so it's meaningless to ask what's north of the north pole, just like it's meaningless to talk about a time before the big bang. He developed this using imaginary time, which is a bit like imaginary numbers. The beauty of this is it gets rid of the Big Bang singularity whilst still containing the concept of time to our Universe. But if there was a singularity, time would still "stop" because of the immense gravitational force.

 

 

 

I suppose time could have different properties in different Universes, but since time as a variant is really only dependent on gravitational field strength it's more likely to be dependent on that.

 

 

 

That's my best guess anyway.

[navyplaya]

Depends which theorem you look at, so i'll explain the one that I know best about.

 

 

 

Stephen Hawking worked on what's called a no-boundary theorem for the Universe. He basically said that the Universe is a bit like the surface of the Earth, except three-dimensional. The singularity is represented at the north pole, so it's meaningless to ask what's north of the north pole, just like it's meaningless to talk about a time before the big bang. He developed this using imaginary time, which is a bit like imaginary numbers. The beauty of this is it gets rid of the Big Bang singularity whilst still containing the concept of time to our Universe. But if there was a singularity, time would still "stop" because of the immense gravitational force.

 

 

 

I suppose time could have different properties in different Universes, but since time as a variant is really only dependent on gravitational field strength it's more likely to be dependent on that.

 

 

 

That's my best guess anyway.

 

 

 

But doesn't that mean theres only one universe, if time didn't exist before?

[r2d2]

ergo uni-

 

:P

[underu2000]

But doesn't that mean theres only one universe, if time didn't exist before?

 

Well, I don't know much about this topic, but let me give it a whirl.

 

As far as my imagination takes me, there could be a time before Big Bang, at least in respect to the Cyclic universe theory.

 

But even then, what really is time? As i see it, time is the dimension in which all events occur in proper sequence. And time, begins with the beginning and ends at the end, probably the end of the universe. So by definition, time can't actually precede the Big Bang, since that would mean that another universe actually existed before it, allowing there to be time. Otherwise, there is no time, since no events occur. An effective eternity, in other words. It is somewhat the reason I hold the cyclic universe theory to be plausible.

[navyplaya]

But thats exactly what I'm saying. The universe could be something of a larger body, just as a galaxy is a unit of the universe. Time doesn't start with each new galaxy that forms.

[underu2000]

But thats exactly what I'm saying. The universe could be something of a larger body, just as a galaxy is a unit of the universe. Time doesn't start with each new galaxy that forms.

 

It's impossible to know, since if there are other universes or dimensions, we won't be able to detect it. We can hardly measure our own universe to begin with. If there are other universes with their own realities, we really won't be able to understand it because our 5 senses are so very limited. Who knows? Maybe there are other dimensions that can be measured and that connects parallel universes together that we just don't know.

 

But then again, there are so many "what ifs", we can't be sure about anything beyond our little Sol system.

 

BTW, if you like this topic, you might be interested in the 10 dimensions.

 

Watch the video here: http://www.tenthdimension.com/medialinks.php

[Rebdragon]

This seems almost more like a philisophical question than a physical one :-k .

[Iamdan]

But thats exactly what I'm saying. The universe could be something of a larger body, just as a galaxy is a unit of the universe. Time doesn't start with each new galaxy that forms.

 

It's impossible to know, since if there are other universes or dimensions, we won't be able to detect it. We can hardly measure our own universe to begin with. If there are other universes with their own realities, we really won't be able to understand it because our 5 senses are so very limited. Who knows? Maybe there are other dimensions that can be measured and that connects parallel universes together that we just don't know.

 

But then again, there are so many "what ifs", we can't be sure about anything beyond our little Sol system.

 

BTW, if you like this topic, you might be interested in the 10 dimensions.

 

Watch the video here: http://www.tenthdimension.com/medialinks.php

 

 

 

Time is only relative to our universe.

[underu2000]

But thats exactly what I'm saying. The universe could be something of a larger body, just as a galaxy is a unit of the universe. Time doesn't start with each new galaxy that forms.

 

It's impossible to know, since if there are other universes or dimensions, we won't be able to detect it. We can hardly measure our own universe to begin with. If there are other universes with their own realities, we really won't be able to understand it because our 5 senses are so very limited. Who knows? Maybe there are other dimensions that can be measured and that connects parallel universes together that we just don't know.

 

But then again, there are so many "what ifs", we can't be sure about anything beyond our little Sol system.

 

BTW, if you like this topic, you might be interested in the 10 dimensions.

 

Watch the video here: http://www.tenthdimension.com/medialinks.php

 

 

 

Time is only relative to our universe.

 

No, time as we know it is only relative to us. You simply must watch that video I linked.

 

Let me try to explain:

 

We are aware of the 3Ds that we can experience, and the 4th that is time. Now imagine all possibly points from beginning to end of time as a line, and that line that can be witnessed all at once. If that were capable of an alien species, they would have a near God-like omniscience, that we cannot understand, much like colors we cannot see.

 

So if you apply this to the universe, such a species would be able to witness all events in the universe at once, so viewing the universe would be like looking at a brochure that you memorized. In the dimension beyond this one, it would be possible to look into not only the future, but possible futures and pasts. This literally lets you branch off into that future and "walk" into it! The possibilities are endless.

 

 

 

Hmm...apologies for going offtopic.

[navyplaya]

This seems almost more like a philisophical question than a physical one :-k .

 

 

 

I think its becoming one, but it wasn't my original intent.

 

 

 

My original question, is about the scientific theories, that in my mind seem to contradict each other, not about the possibilities.

[Mercifull]

Watch the latest episode of The Sky At Night on the BBC website, last week they had a person who discussed this very subject. the language might be a bit beyond you but you can lookup what they are saying on Wikipedia and stuff for more simple to understand answers.

[Death_By_Pod]

It doesn't matter what time it was at the start of the universe it could be t = 4234 for all it matters, t = 0 is used because it is convenient and it also implies that it is the beginning of the universe. It's like setting height to be 0 metres at sea level, it's just an arbitrary point. It doesn't say anything about whether other universes exist or not.

[Quoi_Tu]

The way I see it, when the universe was created from the big bang (as current theory states) it was created infinitely large and continues to change. Time is just our way of measuring these changes. I'm sure time existed before the big bang, we just have no way to measure it.

[TotalTalker]

It's more than likely that we will never know what is beyond the universe becuase it is expanding all the time at I think the speed of light. And since as its more or less impossible to go as fast as the speed of light (and even if we did, we wouldn't catch up with the end of the universe because we will be going about the same speed as it is expanding), we would have to catch up with it, which would mean we would have to go faster than the speed of light, which I think is virtually impossible.

[wizarthas460]

The way I see it, when the universe was created from the big bang (as current theory states) it was created infinitely large and continues to change. Time is just our way of measuring these changes. I'm sure time existed before the big bang, we just have no way to measure it.

 

 

 

yep, time is a completely human discovery, since we have it, we seem to run out of it.....

 

 

 

anyway, no one knows whats the...hmmm..."truth"

 

 

 

even if someone says behind the wall of the universe is a giant jelly pudding he has as much proof as anyone else has.

 

 

 

the only reason we dont believe that is becaus it seems to fit all in place what hawkins, einstein etc. says

 

 

 

So lets all say, after the universe there is pudding!!!!!!! :

[ktmcf121]

well, all philosophical arguments aside(simply because i hate discussing them), the scientific explanation is this:

 

 

 

if you havent noticed, scientists like to make complicated things as easy as possible so that we can understand them better, so when time is involved, t(0) is usually set equal to 0 at the time which makes it easiest to solve the problem. so in the case of a falling object, t(0) is set to 0 at the instant the object is released, or in the case of the universe, t(0) is set to be 0 at the big bang, or whatever "beginning of the universe" theory you're investigating.

 

 

 

in science, time is all relative to the problem. you can manipulate it the same way you can manipulate coordinate systems to make the problems easier.

[navyplaya]

The way I see it, when the universe was created from the big bang (as current theory states) it was created infinitely large and continues to change. Time is just our way of measuring these changes. I'm sure time existed before the big bang, we just have no way to measure it.

 

 

 

yep, time is a completely human discovery, since we have it, we seem to run out of it.....

 

 

 

 

Your right, it was a human discovery, but its not a human invention which is what I think you meant.

[meol]

As far as I know, t=0 is only a Frame of Reference to set a beginning for it, as it is the first/oldest thing that we suspect happened.

[Kilo]

The way I see it, when the universe was created from the big bang (as current theory states) it was created infinitely large and continues to change. Time is just our way of measuring these changes. I'm sure time existed before the big bang, we just have no way to measure it.

 

 

 

yep, time is a completely human discovery, since we have it, we seem to run out of it.....

 

 

 

 

Your right, it was a human discovery, but its not a human invention which is what I think you meant.

 

 

 

And explain to me where this invention is, and if its an invention, there must be an inventor. Slip my beliefs in suddley lol...

[wizarthas460]

The way I see it, when the universe was created from the big bang (as current theory states) it was created infinitely large and continues to change. Time is just our way of measuring these changes. I'm sure time existed before the big bang, we just have no way to measure it.

 

 

 

yep, time is a completely human discovery, since we have it, we seem to run out of it.....

 

 

 

 

Your right, it was a human discovery, but its not a human invention which is what I think you meant.

 

 

 

And explain to me where this invention is, and if its an invention, there must be an inventor. Slip my beliefs in suddley lol...

 

 

 

well, can you tell me the inventor of the weel?

 

same for this.

 

and you can find the inventor of the current time scale here:http://en.wikipedia.org/wiki/Second

 

 

 

so the time(like past/future, etc) is a human discovery,

 

but the time (seconds minutes hours days weeks months years...etc), is an human invention....hope im a bit clearer now :