Do wormholes really exists?

[Pradeepkumar]

I read that by going through a warm hole, we can go to future ,is it true??

[ajb]

What do you mean by true?

 

What is true is that general relativity in the presence of exotic matter can (at least classically) support what we call wormholes. It is also true that in general relativity, such wormholes can be used to give apparent faster that light travel and so give rise to time travel. Not all worm holes are (classically) transversable, meaning some will have great tidal effects that will rip apart any observer falling in. However, there are wormholes that can be traversed, look up the Thorne wormhole solution.

 

Now, do wormholes exist in nature? Probably not at the scale in which we could travel through them. Simply, nature does not seem to have any of the exotic matter needed to support them. However, quantum fluctuations could in principle support micro wormholes. So maybe particles could travel through wormholes, but it seem unlikely that we ever could.

 

Another problem is the so called "chronological protection conjecture". In this setting it basically says that quantum effects would actually destroy the wormhole. Basically as an observer enters the wormhole he would destroy it. (I think explaining why is too detailed for now, but I should remark that no-one has proved the conjecture in general. Only examples have been worked out.)

[DJBruce]

Martin posted something that suggests that they are not possible.

 

http://www.scribd.com/doc/3366486/SelfOrganizing-Quantum-Universe-SCIAM-June-08

 

"Although such phenomena have never been observed, physicists have speculated that wormholes might fnd a justifcation within the still unknown theory of quantum gravity. In view of the negative results from the computer simulations of Euclidean quantum gravity, the viability of wormholes now seems exceedingly unlikely. Wormholes come in such a huge variety that they tend to dominate the superposition and destabilize it, and so the quantum universe never gets to grow beyond a small but highly interconnected neighborhood."

 

Thanks to iNow for showing me this.

[iNow]

And in turn, thank you, Martin.