Ftl Definition and 174 Threads

I am puzzled with the following gedankenexperiment. Consider a pair of particles that are sent from x = 0 on different directions +x and -x with entangled position on the y axis. Parallel to the y-axis we locate two double slit plates A and B. They plate A is located at x = -L and the plate B...

Hi all, I am reading pretty much everywhere that no quantum protocol for faster-than-light communication can exist. Now, clearly neither super-dense coding nor any other quantum protocol I know of can be used for FTL communication - but is there a self-contained proof that no such protocol can...

The famous Bell experiment would somehow proof non-locality and/or traveling of information faster then light. A very simple explenation of the experiment is this: there is a subatomic event that creates a particle pair going opposite directions. The subatomic event determines the possible...

As a preface to my question, I am in no way asserting a FTL posibility which violates the posulates of Special Relativity. Throughout several online articles and books that I have been reading, there has been a referance to some sort of warping of spacetime that allows you to, in their words...

i don't know where to put this so feel free to move it: I wolud like to discuss ways of Faster than light transport using singularity based forms. (not in reality, only good ways of doing it) thers always the basic one of: ship> }-----------worm hole----------{ but what about...

I know crazy unsupported theories aren't supposed to be posted, but I have been working on some fiction which requires faster than light travel. I have read many other guides to ftl in SciFi, and I had origionally fitted in a form of hyperdrive, which would simply avoid the issue by ignoring the...

http://news.scotsman.com/scitech.cfm?id=16902006 what?

Arguments against FTL communication are usually based on causuality arguments, which I tend to agree with. But it seems to me that the 'backwards in time' problem seems to make an assumption that might not always apply, ie that FTL velocity would be relative to C for all observers. Here's...

Why can't "Spooky action" send FTL information? I understand that for two entangled particles, that if you observe one it will instantly affect the other. I can even understand how we can't make sense of what was observed without sending a "Hey, I got and 'up' what about you?" But what I...

I was thinking a while back, after reading something about inflation. if you could build a device that will increse the distance between you and an object(lets say earth), you would be able the change posision faster then sublightspeed motion allows. because you would create distance, of which...

I have heard many suggestions for ways to travel faster than the speed of light. Everything from the more mundane (wormholes) to the extreme (Alcubierre waves), although I suppose it's all exotic when it comes to this field. Getting to the point, however, I would like to hear your opinions of...

Is there any theories or something of that sort, which allows negative mass? Hence, v > c rather than v < c. This seems like the only logical possibility to FTL travel.

FTL travel in a light cone? I read in several places there there is one condition in GR, that will allow you to travel faster than light, and allow time travel to the past. Can someone explain this further, without getting too mathamatical (Ok, maybe a little math). Thanks in advance :smile:

So, if I'm thinking of this correctly... The faster we travel, the slower time progresses for those traveling. We go faster, time for us slows down. Just for ease of example, let's say the travelers are traveling exactly at c. They travel toward a star that is 10LY away - so at c...

Hi, I've been reading David Albert's book "Quantum Mechanics and Experience," and it got me thinking about how one could use Stern-Gerlach sorts of measurements on entangled electron pairs (or electron-positron pairs) to transmit a statistical signal from one to the other. Let's say you...

I figured this might spark some interesting debate with regards to time and FTL travel. First off if you were traveling at or near the speed of light wouldn't your body be stretched out thin like a noodle, so much so, that your stretched pencil shaped blood vessels would have trouble fitting...

1st Question: Just how firmly established is the idea that, not only can't anything with a non-zero mass be accelerated to C+ speeds, but that *information*, of *any* kind, can not be sent from one point to another in less time than it would take a beam of light to cover the distance in a total...

First post. There's something I don't quite understand about quantum entanglement and I'm hoping someone here can put me right. When I first heard about the Aspect experiment, I thought that it had to open the way forward for faster-than-light information transfer as follows: Bob is on...

After playing around equations producing velocities greater than C in normal space due to space-time warping i had the theory that if a graviton travels at the speed of light and gravitons are the messenger particles of gravity (assuming that gravitons warp space-time by nature ) that depending...

Firstly, just a high to everyone, (first post, aye). Now, everyone has been saying that FTL Travel (Faster than Light) and even the speed of light is impossible. (dammit... ) than how is it that light can go at the speed of light. Now, for some touching back on the SOL theory. As you...

The Earth has a gravitational pull that attracts things to it correct? If we launced a rocket from Earth and said rocket was traveling from the ground to space at, oh let's say, 100 miles per hour (or kilometers - it really doesn't matter). Given the slow speed of the rocket, it would never...

Special relativity asserts that an object approaching the speed of light would also increase its mass to the point that even an infinite supply of fuel/energy would not be able to push that little go-kart passed the critical limit of C, right - close enough maybe? Why is C the limit? Is it...

This is a pretty basic concept of relativity that used to make sense to me but I have since become a little unclear on the issue. The question is how can one violate the principle of causality simply by broadcasting information that travels faster-than-light?

My woodshop teacher, who is a physics hobbyist, insists that by using magnitism to stretch time, we could travel faster than light. I protested at the idea; but my explanations of how time doesn't matter much when it comes to ftl travel, and the fact that you need infinite energy failed to...