# Teleportation (like a StarGate) and Time travel

1. Apr 24, 2004

### Cyberice

I'm not sure if this is the right place to put this thread but...

Are they possible? I have been watching alot of StarGate SG-1 and other movies that deal with these two issues. First I want to know if matter can be effectively molecularized and reassambled in its original form (anything - from a chair to a human), even if it's only a few feet across a room? And then (I think Einstien said it was possible) I want to know if time travel is possible and the (non-mathematical only explanatory part) theory of how it's possible. Do these two phenomenon take place in the 4th dimention? If so, how? I would appreciate any help.

2. Apr 24, 2004

### Mike2

You might consider the amount of entropy that changes in the process. This might give you an idea of how much energy would be required to reassemble it.

3. Apr 24, 2004

### LURCH

You probably already know about how master can be converted to energy via Einstein's famous equation, e=mc2. This is the means by which nuclear weapons generate an explosion. A tiny amount of the hydrogen in the center of an H-bomb is converted from matter to energy in these few small drops of hydrogen release all that blast. Considering the mass of a human body, imagine the amount of energy that would be released if one work converted entirely to energy. All of this energy would have to be contained in control.

Wormholes are not out of the question, according to our current understanding of the dynamics of space-time. However, for a wormhole to exist and stay open long enough for anything to pass through would require the presence of a very exotic form of energy known as "negative energy". Negative energy can only exist in a system containing a greater amount of positive or "ordinary" energy. The amount of negative energy needed to hold a wormhole open is a direct function of the size of the whole. To open and maintain a wormhole large enough for a person to pass through would require more energy than one would get by converting all the mass of all for matter in the universe.

But of course, these are mere problems of power requirement. The concepts are possible, if we can find some way around their copious demands for power.

4. Apr 25, 2004

### OneEye

The reassembly bit is a trifle tricky.

"Molecularized" - broken into component molecules - is not really the solution, since one would need to transport the molecules reliably (sequentially?) from one location to another. Tricky.

Probably more effective to try to analyze the physical construction of an object into information, transport the information, then construct a duplicate of the original using the information. Still tricky, but perhaps not as tricky.

Then, of course, you would still have the original to deal with....

It's the old Star Trek problem: Just because you have dematerialized something and reconstructed it at another location does not necessarily mean that you have the same thing - rather, in almost every circumstance, you have only a copy of the thing.

By and large, I do not believe that "teleportation" will ever work - at least, not in any meaningful way - and especially not in a way people will trust. - and not using known science or imaginable technology.

The main reason that we want teleportation is because we are in an awful hurry. We are in a hurry because we die quickly, and because we are bored with the process. What if both of those problems could be resolved? Would we still be in such an all-fired hurry?

5. Apr 25, 2004

### GRQC

Careful, this is not true. The energy from nuclear explosions is derived from the difference in binding energies between parent and daughter products in fusion / fission reactions. The hydrogen (deuterium and tritium, actually) is not converted directly to energy.

6. Apr 26, 2004

### LURCH

The mass of the hydrogen is.

7. Apr 26, 2004

### GRQC

The mass of hydrogen is roughly 930 MeV, while H/D/T fusion reactions release between about 5-25 MeV (per fusion). That's over an order of magnitude difference.

8. Apr 26, 2004

### LURCH

That's what I said: "a tiny amount"

It is possible, however, to convert nearly all the mass of a certain bit of matter into energy, through an antimatter reaction. But the important thing is that even if one converted all the mass in the universe into energy, there would still not be enough to form a system in which could exist the amount of negative energy needed to form a stable wormhole large enough for space travellers to go through.

9. Jul 9, 2004

### VantagePoint72

Getting back to your questions cyberice:

Teleportation

Time travel

Teleportation and time travel are definitely on the cutting edge of physics. They may slowly move from the realm of science fiction to solid science, or they may remain idle fantasies of the human mind. Time will tell.

Hope that helps!

10. Jul 10, 2004

### rayjohn01

Any article that I've seen on teleportation through entanglement, discounts faster that light transmission of information, I assume to rebuild something information is required so it would not seem to work , at least that way.
Ray

11. Jul 10, 2004

### Entropy

If you really did deconstuct someone and then rebuild them (or someone just like them) at another location. Would that be the same person or just a copy of the original?

12. Jul 10, 2004

Staff Emeritus
The answer depends upon what consciousness is. If it's entirely a physical process, and the reconstruction accurately reproduces that process, then it's the same person. If consciousness is some mystical extra-physical thing, then there's no guarantee the new body would possess it.

13. Jul 10, 2004

### LURCH

However, if consciousness is an extra-physical thing, then it would seem likely that this phenominon, being free of the constraints of physical law, would find its way to the body with which it is associated far more easily than the body itself translates from place to place.

14. Jul 11, 2004

Staff Emeritus
"It would seem..." Would you trust this if it was you who were to be teleported? I sure wouldn't.

Actually when they get up to teleporting bacteria, that will be another test of whether there is a separate "life force" or not. Does the teleported bug arrive alive or dead.

15. Jan 19, 2010

### Scorpionjerac

Question Time Travel Like on Star Gate SG1 the people are demoleculerized to what degree?

Because if they are turned to energy and then transported to the other gate then reassembled the worm hole wouldn't have to be any bigger then a pin hole!!! Now if they were just demoleculerized to there basic atoms the worm hole would only have to be as big as the biggest atom then the rest of the atoms would just follow the big atom!!

16. Jan 19, 2010

### Frame Dragger

I'm going to step aside on the teleportation issue and just go to that old standby... the Closed Time-like Curve. Traveling faster than c in your own Frame = Time Travel. Same thing. If you travel 1 billion ly in a moment, no matter how you go about it, you're breaking causality, and opening the possiblity that CTCs will be created.

Besides, "wormhole" is an ambiguous term. Do you mean an Einstein-Rosen Bridge? That is just one instance of a wormhole, and not a traversable one. A hypothetical ring-singularity with a double Event Horizon? See previous paragraph.

It doesn't matter if you use the curvature of spacetime, or a fictional rocket... FTL travel leads to the possibility that the laws of physics will not appear to be the same for all observers, and causality goes out the window (see Hawking's "Race on Alpha Centauri" example). If you observe event A from 1 billion ly away from your initial Frame, which you reached at a speed greater than c than Event A might be an event for which you ALREADY KNOW THE OUTCOME. Some believe this is entirely possible in a universe which contains the negative curvature needed for a stable ERB-type wormhole... but that's not our universe now or at any point in its known history.

People discount FTL transmission of "Information" (the term of art) because it is the same as time travel.