M theory is the Membrane theory. It is the theory that our universe is a bubble floating within an infinite realm of other universes. In M theory, there are 11 dimensions. 10 spacial and 1 time.
M theory suggests that for every outcome in an occasion, there is a universe where that outcome took place.

For instance, M theory suggests that if you figured out a way to go back in time (its possible), and changed an event, that it would only take effect in a whole different universe. If you were to travel back to your time after making the change, nothing would have changed. The only change would be in the new universe.

However, there would also be entirely new universes with perhaps different laws of physics.
That also might explain the Big Bang theory. Perhaps the collision of two other universes lead to the creation of our universe?

What you are describing sounds more like the "multiple universes" interpretation of standard quantum mechanics than anything I have read about M theory. But I admit that I have not read much since it is currently not a testable theory.

-Dale

well time traveling is currently not possible in the purest sense humans want it
Also why are there only 10 dimensions and 1 special?
And yes perhaps there are many universes and the unification creates a big bang.

But once again...this is all theories based on nothing but thoughts.

Actually I believe that it is based on calculations. ...And thoughts.

The "multiple universe" theory is the M theory.

All theories are FIRST thoughts, then scientists use calculations to work out the thoughts, then some theories get proven. HOWEVER, no matter whether a theory is proven or not, all science is disprovable. Just because a theory might be proven for now, it is still disprovable.

And time travel is possible. You just have to find out how to accelerate beyond the speed of light, which so far we can't do. Theoretically, that's what you have to do though.

Time travel into the future is possible.
And you dont accelerate beyond the speed of light, you have to travel at a very high speed for a period of time. Something like 50% the speed of light.

No, it's not. M-Theory is an attempt to unify various string theories. There is no "multiple universe" *theory*: it's a philosophical interpretation arising from the issue of non-determinism.

Theoretically, it's not possible to accelerate beyond the speed of light. The only (backwards) time-travel schemes that are consistent with mainstream physical theories involve wormholes.

M theory arised from the superstring theory.

There is a multiuniverse theory. It's not anything philosophical. Theoretical Physicist Michio Kaku explained that it is in fact possible that there could be other universes, and then he showed an equation (but I forgot it).


Wormholes are like "portals" between two points in the universe. When you enter a wormhole, you aren't in the space-time continuom (the largest continuom) anymore. Instead, you are sorta accelerated beyond the speed of light and are jetted out to another point in the universe. However, so far the only wormholes are Quantum Wormholes. It is too difficult to make them larger, because it takes INSANE energy to do so.

You HAVE to travel beyond the speed of light to travel in time. Einstein said that as you approach the speed of light, time slows down, and once you pass it, time reverses.

Einstein could be wrong, but it might be possible that there is a way to go beyond the speed of light. Theoretically, the speed of light (186,000 mph) cannot be broken, but there might be a way.

It is possible, but so far there is no evidence at all that there are any other universes.

A wormhole is really more of a bending of the space-time continuum. Entering a wormhole doesn't take you out of spacetime. Theoretically, you are correct that a wormhole might provide a shortcut which would look a lot like faster-than-light motion. However, there's no acceleration beyond the speed of light involved.

There's also no evidence of quantum wormholes right now. They may or may not exist; we don't yet know.

You're travelling forwards in time right now, just sitting at your computer.

Einstein said you can't ever reach the speed of light, let alone pass it.

All the evidence suggests you can't exceed the speed of light if you're travelling in spacetime. But as I said, a wormhole might let you jump from one region of spacetime to another. Another idea is the "warp drive", which would compress spacetime so as to let you move from one region to another at an apparent faster-than-light speed.

lol, as if that would explain the origin or cause of the universe, you'd still hav to explain where those damn "universes/branes" came from!!

i think einstein was kidding when he said that.. at least in some mediums particles can can go faster than the speed of light, and maybe the universe expands faster than the speed of light, and the lobes of some quasars appear to be moving apart faster than light.

The multiple universe interpretation does not explain any observations, or make any predictions at all. Therefore, it does not qualify as a "theory."

Be that as it may, the energy involved is chump change compared to the energy required to accelerate even the tiniest massive particle past the speed of light (i.e., infinite energy).

Relativity says that nothing can move faster than the speed of light *in a vacuum*. Since the speed of light in any medium is always slower than that in a vacuum, there is no conflict with relativity.

So let me ask a question, what is going to be the eventful find when the unification of GRT and M theory is reached? I know the unification only makes sense but is there any other implications? Thanks

P.S I am not an expert in this field.

Not entirely accurate; the "many worlds" hypothesis is advanced as one of several possible theoretical explanations for Bell's theorem, as demonstrated by the experiments of Alain Aspect and others. It does not, as yet, make any testable predictions, though.

c7it,
the universe itself expanding faster than the speed of light is the expansion of space-time itself. i think there have been some experiments where a laser seemingly traveled faster than the speed of light, but the information did not.

chatha,
do GRT and m-theory need unification? are you referring to the theory of everything? the big unification everyone is looking for is between relativity and QM. that is where string (M) theory comes in.

as a sidenote, it is hard to imagine that people who can dismiss M theory as 'merely thoughts' have really looked into the details and math of the theory itself.

There are many other ideas relating to a hollistic universe so I dont think M-theory as mere thoughts. So whats the problem with the unification and what are the implications?

P.S I don't know jack shit about this subject, just some basics I picked up.

One big issue with unification theories, from a practical standpoint, is that extremely high energies are required to test them. That is, the "unification" is only thought to occur at high energies, as would have occurred in the early universe. So, you need very expensive high-energy systems (i.e., particle accelerators) to test unification theories.

The reason we are looking for a unification of QM and general relativity is that gravity currently presents a problem. You can start with wiki & go from there:
http://en.wikipedia.org/wiki/Quantum_gravity

This definitely does not sound like Cerenkov radiation to me - what are your sources? The quasar one seems interesting - but I am skeptical of both claims.