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PrideLess
Posts: 668
Location: 01 E4 2B 36 0E 1A EB 03 28 4C FF C7 11 A0 E7
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 Posted: Mon, 7th Apr 2008 18:24 Post subject: |
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LeoNatan
☢ NFOHump Despot ☢
Posts: 73259
Location: Ramat HaSharon, Israel 🇮🇱
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| Posted: Mon, 7th Apr 2008 18:27 Post subject: |
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You could say "Hi" to light particles because you are faster than them? 
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LeoNatan
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Posts: 73259
Location: Ramat HaSharon, Israel 🇮🇱
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| Posted: Mon, 7th Apr 2008 18:29 Post subject: |
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| Quote: | Quantum mechanics
Certain phenomena in quantum mechanics, such as quantum entanglement, appear to transmit information faster than light. According to the No-communication theorem these phenomena do not allow true communication; they only let two observers in different locations see the same event simultaneously, without any way of controlling what either sees. Wavefunction collapse can be viewed as an epiphenomenon of quantum decoherence, which in turn is nothing more than an effect of the underlying local time evolution of the wavefunction of a system and all of its environment. Since the underlying behaviour doesn't violate local causality or allow FTL it follows that neither does the additional effect of wavefunction collapse, whether real or apparent.
The uncertainty principle implies that individual photons may travel for short distances at speeds somewhat faster (or slower) than c, even in a vacuum; this possibility must be taken into account when enumerating Feynman diagrams for a particle interaction. To quote Richard Feynman:
"… there is also an amplitude for light to go faster (or slower) than the conventional speed of light. You found out in the last lecture that light doesn't go only in straight lines; now, you find out that it doesn't go only at the speed of light! It may surprise you that there is an amplitude for a photon to go at speeds faster or slower than the conventional speed, c"[19]
However, macroscopically these fluctuations average out, so that photons do travel in straight lines over long (i.e. non-quantum) distances, and they do travel at the speed of light on average. Therefore, this does not imply the possibility of superluminal information transmission.
There have been various reports in the popular press of experiments on faster-than-light transmission in optics — most often in the context of a kind of quantum tunneling phenomenon. Usually, such reports deal with a phase velocity or group velocity faster than the vacuum velocity of light. But, recall from above, that a superluminal phase velocity cannot be used for faster-than-light transmission of information. There has sometimes been confusion concerning the latter point.
Quantum teleportation transmits quantum information at whatever speed is used to transmit the same amount of classical information, likely the speed of light. This quantum information may theoretically be used in ways that classical information can not, such as in quantum computations involving quantum information only available to the recipient. In science fiction, quantum teleportation is either used as a basis for teleportation of physical objects at the speed of light, presumably preserving some important aspect of the entanglement between the particles of the object, or else is misrepresented as allowing faster-than-light communication. |
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LeoNatan
☢ NFOHump Despot ☢
Posts: 73259
Location: Ramat HaSharon, Israel 🇮🇱
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| Posted: Mon, 7th Apr 2008 20:40 Post subject: |
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PrideLess
Posts: 668
Location: 01 E4 2B 36 0E 1A EB 03 28 4C FF C7 11 A0 E7
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| Posted: Mon, 7th Apr 2008 20:41 Post subject: Re: What would happend if .... |
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CaptainCox
VIP Member
Posts: 6823
Location: A Swede in Germany (FaM)
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| Posted: Mon, 7th Apr 2008 20:52 Post subject: |
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| Posted: Mon, 7th Apr 2008 20:57 Post subject: |
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i wonder what will happen when you break it if you compare it to breaking the speed of sound. the bang by breaking the speed of sound is all the sound you produced added in one (to keep it simple), so what kind of energy would be released with breaking light speed
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deelix
PDIP Member
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Location: Norway
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| Posted: Mon, 7th Apr 2008 21:15 Post subject: |
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nice to know its not only me who thinks about stuff like this when taking a shit.
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LeoNatan
☢ NFOHump Despot ☢
Posts: 73259
Location: Ramat HaSharon, Israel 🇮🇱
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| Posted: Mon, 7th Apr 2008 21:29 Post subject: |
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Oh, for sure!  Bookmarked that page posted above for my next sitting.
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| Posted: Mon, 7th Apr 2008 22:50 Post subject: |
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| JeanPerrier wrote: | | i wonder what will happen when you break it if you compare it to breaking the speed of sound. the bang by breaking the speed of sound is all the sound you produced added in one (to keep it simple), so what kind of energy would be released with breaking light speed |
It's not possible in newtonian physics. Besides which matter and electromagnetic radiation interact in a completely different way to the kinetic vibrations which comprise 'sound'.
Edit: Regardless of how fruitless it may be, I still think curiosity is a healthy human initiative. So it's not really fair to criticize someone for it, even if they are ignorant of the subject in question. It's only when people draw the wrong conclusions from this ignorance that it can be a detriment to society.
"Techniclly speaking, Beta-Manboi didnt inject Burberry_Massi with Benz, he injected him with liquid that had air bubbles in it, which caused benz." - House M.D
"Faith without logic is the same as knowledge without understanding; meaningless"
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Rinze
Site Admin
Posts: 2343
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| Posted: Tue, 8th Apr 2008 01:31 Post subject: |
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Basically nothing strange happens, the speed of light is the same whatever speed you go at, so the headlights shine ahead.
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| Posted: Tue, 8th Apr 2008 10:33 Post subject: |
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NOOOOOO!!! Lorentz transformations!!! AAAAA!!! (Heavy frustration based on stupid homeworks on uni)... 
"Quantum mechanics is actually, contrary to it's reputation, unbeliveably simple, once you take the physics out."
Scott Aaronson | chiv wrote: | | thats true you know. newton didnt discover gravity. the apple told him about it, and then he killed it. the core was never found. |

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| Posted: Tue, 8th Apr 2008 22:04 Post subject: Re: What would happend if .... |
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| swingman wrote: |
You're missing the whole point of a thought experiment. |
Hardly. A thought experiment needs some sort of consistency otherwise it's pointless.
Why consider a question like "How high could you jump if there was no gravity?" when it has no answer. It's the same as asking "How would light behave when it is radiated from a relativistic source?".
If the answer to a question depends on a rule that you've already defined as broken then attempting to answer it is an exercise in foolishness.
"Techniclly speaking, Beta-Manboi didnt inject Burberry_Massi with Benz, he injected him with liquid that had air bubbles in it, which caused benz." - House M.D
"Faith without logic is the same as knowledge without understanding; meaningless"
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