Speed of Light Barrier

That is a sensible way of describing the situation.

Plausible given a sufficiently advanced technology. Mod has already mentioned Alcubierre's idea, and this was suggested before we knew of the accelerative expansion of the Universe (very odd to think that...) Dark energy is precisely the type of field we need to manipulate to generate this warp field, or create worm-holes. But we are talking engineering and energy scales on the order of stars... so say a 1000 years to get to that stage, and then another 1000 to fit it into your car

Because they are zero rest-mass partciles. Given the need for you to ask the above question, it is abundantly clear that you are in no position to make such statements. All that is clear is that you are confused. No biggie - there are not many that are not confused by relativity...

Not in the sense you are thinking, but this needs mildly caveating - if the energy content of a volume is not in the form of a solid mass, then the energy distribution will be different, which will cause a different effect upon the local space-time. To create any "anti-gravity" effect (wormhole, Alcubierre warp drive, etc) you need a -ve energy density or "exotic" matter. Examples of this are Casimir energy, dark energy, and the inflaton field.

When you get close to c, you are no longer dealing with something that you would recognise as "speed". Speed is a concept that only makes sense somewhat *below* c. Tachyons do not "travel" in any obvious sense. c itself simply reveals our own length/time-scale within the geometry of space-time.

Not really. You can only determine the photon's properties by its effect when it interacts with something. By that time it no longer exists. You cannot observe/measure/experiment-on photons in transit.

Yes, this is essentially correct.

And given that SR is the most successfully tested theory EVER, I guess it is on fairly good ground And what medium is light using exactly? Yes, as the most successfull theory EVER demonstrates this, and EVERY particle accelerator experiment demonstrates this PERFECTLY.We accelerate protons at CERN to an energy of 7TeV. The Kinetic energy to reach c in Newtonian terms is 0.5GeV. And yet they refuse to go any faster than 99.9999991%c. Why is that? Bloody mindedness? One would have a world view based upon both all available evidence and remarkably solid theory. But if you want to belive in fairies, no-one is stopping you No, they won't. An analogy is NOT an equivalence.

this is child's play relativity and cosmology - the answers to these are explained in every 3rd year physics undergraduate cosmology course in every physics department around the world, every year. God knows how many times I've taught it.You seem to be making the world's oldest mistake of assuming that just because YOU don't understand something, it means that NO-ONE understands. Something that travels at c goes unlimited distance in zero time. What would you call faster than that? The speed of light is not a "speed limit" - it is the point where the concept of speed has completely broken down. Velocity is actually a rotation when looked at from the 4-dimensional perspective, but this is only apparent whne you are close to c. Asking to go faster is like asking at what angle you need to turn a 1m ruler, so that it is now 1.2m long. It is utterly non-sensical. shaky footing??? only in your head, I'm afraid I have. I have played acoustic relativity many times with my colleagues and students. And you are wrong. But at least you are consistent. Err, no Oh, the cluelessness knows no bounds...

I saw this the other day, and was determined to post it here - but forgot So thanks!!! And could it possibly be more appropriate?