You want to create a wormhole? For gawds's sake why?
THEORY:
So how do you create a wormhole? Well there are a number of ways.
It has been suggested that wormholes occur naturally, but only on very small scales. Normally on our macroscopically scales, space time is flat(if something is not bending it). But if you zoom in on it through the particle level and down to something called the Planck length(10-33cm) space time will get more and more severely warped and not smooth at all any more. So at this level where space time warps naturally and in a chaotic fashion, you should be able to find tiny natural wormholes. And then it would be possible to take one of them and enlarge it so that we could travel through.
Another possibility is to bend space time our self, already on macroscopically scales. Then move this little pocket which we just created to the place were we want to go, tear a hole into the space time in our pocket and the space time at the place we wanted to go to, and then "sew" the two rips together to create a tunnel(the worm hole). The problem is that the ripping part would create a singularity, and singularities are very nasty things, which have a tendency to first stretch people into spaghetti and then crush them into very small things. So we don't want a singularity but is there a way to create a wormhole without a singularity? Yes there is, the problem being that at the moment it is being created, time has to be distorted in all reference frames. Which means that at that particular moment you would be able to travel both forward and backward in time. So it's not certain that this works.
First lets see what happen to a body which is accelerated.
According to relativity, acceleration makes time slow down. But in the same theory every observation measures their own time as going at a normal rate. So if we have two observers with the extremely personal names A and B. Then A stays still while B accelerates up to close the speed of light. Now because of the acceleration, Bs time has to slow down, but at the same time he can't notice any slowing of time. So instead as seen from As point of view(reference frame) Bs time does slow down and he starts to move slower. But as seen frome Bs reference fram As time speed up instead! And that 'time speed up' around B compensates for thé fact that he sees his own time as going at a normal rate, if things speed up around him it is just as if he slowed down himself. The important thing is that both their times are "in the smae proportions" to each others, which means that in both reference frames A's time does go faster then B's.
Now we'll see the strange way in which time is connected though a wormhole.
A and B both have one mouth of the worm hole each. Then B speeds away at close the speed of light. Now he can either look back and directly observe A or he can observe A through his wormhole. If he looks back he sees A moving away from him, and so he knows that the are in different reference frames and he also notice that As time moves faster. But if he looks through the wormhole he get's one, stable view of A. A doesn't move away from him, it is just af if B himself was standing right beside him. At first glance this might look like it's just a trick, but not according to relativity. According to relativity, if two things doesn't move relative to one another and if none of them exist in an externally applied gravitational field, then they are in the same reference frame. So this leads to a strange observation; through the worm hole A and B is in the same reference frame but otherwise they're in different!
So now if A goes through his mouth of the wormhole he then comes out into Bs mouth, and Bs reference frame where time has been speeding up around him due to acceleration so then A has moved forward in time. But then if B goes through his mouth of the wormhole he'll come out in As reference frame, and in that frame time was moving normal (that is, slower then at B) and so B will have travelled back in time.
Now, there were some problems of course. What if a beam of radiation travelled from the still standing mouth to the moving one and into it, then it would travelled back into time and exited the still standing mouth just at the same time it originally started to move toward the moving mouth. Then it would meet up with itself and create a beam which where twice as strong and then start to move toward the moving mouth again, travel back into time, meet up with itself and the beam would get stronger, and so on. So an infinitely strong radiation beam would emerge and this beam would be enough to collapse the wormhole.
A beam normally travels in a straight path through space. But at a wormhole the space is warped which means that the straight lines bend. Therefore the wormhole would spread the beam out, making it impossible for it to add up with itself and create a infinitely strong beam.
But this isn't the end of the story. Another kind of radiation called electromagnetic quantum vacuum fluctuations, and those beams when studied, it was found that they don't get spread out. Or more precisely, they first get spread out like the radiation above. But later they gather together all by them self to create the original beam and it goes through the wormhole and start to pile up on itself to create a beam that will collapse the wormhole. So the gravitational effect couldn't save us here, but it was also found that the intensity of the beam behaved in such a way that, first its intensity raised to very high levels but then the intensity died out. This created a radiation peak. And it was found that the time span when the energy levels got high enough to collapse a wormhole, happened within a time span of 10-43 seconds, the Planck time. And the Planck time represents such a tiny time interval that time doesn't have any specific direction, actions taking place under this time doesn't exist. Therefore the dangerous peak disappears and the energy never gets so high as to collapse the wormhole.
There was of course another problem. Time is something relative, you can't just say 10-43 seconds, you have to define in what reference frame. It had been thought that 10-43s from the reference frame of someone at rest in the wormhole . But instead it should be 10-43s as seen from the beam of the electromagnetic quantum vacuum fluctuations. So the radiation beam could only be keept weak if the dangerous peak of energy happened in the time span of 10-43s from the radiations point of view. But a time span of 10-43s in the radiations reference frame looks like a time span of 10-95s from the reference frame of someone inside the wormhole which the previous calculations where based of. So then the time span would be to short to be able to cut of the radiation energy before it became too high.
But nothing is certain. 10-95s might very well be enough to cut of the energy in time. In order to know for sure we need better understanding of something called quantum gravity, which we don't. But right now it seems to point toward a wormhole collapse.
Quantum Gravity will be discussed sometimes in the future. /ttiforum/images/graemlins/smile.gif
anyone else have any theories? hehe /ttiforum/images/graemlins/smile.gif
