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"Speed of Light"
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<blockquote data-quote="Umbran" data-source="post: 6257052" data-attributes="member: 177"><p>Yep. It is a standard in how we do physics these days. Mind you, stealing energy from the vacuum like that is pretty rare, and usually only short term. If you take and put back, what we at a distance will see is no change.</p><p></p><p></p><p></p><p>Not at all. But when a photon interacts (and either gains or loses energy), it changes frequency, but not speed. </p><p></p><p>Though, to be honest, that's not a very accurate picture. An interaction on that level is more like, "Particle-antiparticle pair pops out of the vacuum. Particle absorbs photon. Particle re-emits photon. Particle-antiparticle disappear back in to the vacuum." The photon is a single quantum of energy - it doesn't do anything by half-measures. </p><p></p><p></p><p></p><p>Well, here'e the thing - by the physical laws as we currently know them, moving faster than light is... nonsense. It cannot happen. In order to accelerate anything with mass to the speed of light requires literally* infinite energy. Accelerating beyond the speed of light then requires *more* than infinite energy.</p><p></p><p>The "going faster than light reverses time" is... a bit wonky, then. Rather than it being a real, physical result, it is more a statement of how silly considering it is given how the math works out - a demonstration of how a paradox arises to show how this really shouldn't happen.</p><p></p><p>And even then, not *all* travel at FTL speeds ends up with you travelling backwards in time. What we can say is that, if you can travel faster than light, it is possible to arrange a path such that you return to your starting physical position before you left it. Not that *every* path results in this, but such paths do exist. Time travel becomes possible, not mandatory.</p><p></p><p></p><p></p><p>*And not that figurative-literally popular these days, but literally literally.</p></blockquote><p></p>
[QUOTE="Umbran, post: 6257052, member: 177"] Yep. It is a standard in how we do physics these days. Mind you, stealing energy from the vacuum like that is pretty rare, and usually only short term. If you take and put back, what we at a distance will see is no change. Not at all. But when a photon interacts (and either gains or loses energy), it changes frequency, but not speed. Though, to be honest, that's not a very accurate picture. An interaction on that level is more like, "Particle-antiparticle pair pops out of the vacuum. Particle absorbs photon. Particle re-emits photon. Particle-antiparticle disappear back in to the vacuum." The photon is a single quantum of energy - it doesn't do anything by half-measures. Well, here'e the thing - by the physical laws as we currently know them, moving faster than light is... nonsense. It cannot happen. In order to accelerate anything with mass to the speed of light requires literally* infinite energy. Accelerating beyond the speed of light then requires *more* than infinite energy. The "going faster than light reverses time" is... a bit wonky, then. Rather than it being a real, physical result, it is more a statement of how silly considering it is given how the math works out - a demonstration of how a paradox arises to show how this really shouldn't happen. And even then, not *all* travel at FTL speeds ends up with you travelling backwards in time. What we can say is that, if you can travel faster than light, it is possible to arrange a path such that you return to your starting physical position before you left it. Not that *every* path results in this, but such paths do exist. Time travel becomes possible, not mandatory. *And not that figurative-literally popular these days, but literally literally. [/QUOTE]
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