Light Barrier: Breaking the Speed of Light?

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Discussion Overview

The discussion centers around the possibility of breaking the light barrier, drawing parallels to the sound barrier. Participants explore theoretical implications, experimental claims, and the principles of relativity in relation to faster-than-light phenomena.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants question whether it is possible to break the light barrier, likening it to breaking the sound barrier.
  • One participant references an article claiming that an experiment has achieved faster-than-light effects, inviting views on its validity.
  • Another participant argues that while the article suggests faster-than-light signaling, it actually describes a phenomenon where the signal envelope's edges behave differently in a specific medium, without violating relativity.
  • There is mention of Cerenkov radiation, where a particle moving faster than light in a medium produces an optical effect analogous to a sonic boom.

Areas of Agreement / Disagreement

Participants express differing views on the validity of claims regarding breaking the light barrier, with some supporting the idea of faster-than-light phenomena under specific conditions, while others emphasize that relativity prohibits massive objects from exceeding the speed of light.

Contextual Notes

The discussion includes references to specific experiments and theoretical concepts that may depend on particular definitions and interpretations of speed and medium effects. There are unresolved nuances regarding the implications of these phenomena on the principles of relativity.

waznboyd
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Hi, just got into the topic of relativity and got curious. Is it possible to break the light barrier similiarly to the sound barrier? I have just found an article that someone had done it. http://www.lastek.com.au/light.htm What are your views on this?
 
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waznboyd said:
Hi, just got into the topic of relativity and got curious. Is it possible to break the light barrier similiarly to the sound barrier? I have just found an article that someone had done it. http://www.lastek.com.au/light.htm What are your views on this?
It should be impossible for a message (information) or energy or particles to travel faster than light. But waves can travel faster than light--as an analogy, imagine a long row of people on a giant bench "doing the wave", with each person having a pre-arranged time to stand, you could easily arrange things so that two people 1 light-year apart would stand up less than a year apart, so the wave of people standing would travel faster than light.

This article goes into more detail on the experiment you linked to, and why it does not conflict with relativity, if you're interested.
 
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waznboyd said:
Hi, just got into the topic of relativity and got curious. Is it possible to break the light barrier similiarly to the sound barrier? I have just found an article that someone had done it. http://www.lastek.com.au/light.htm What are your views on this?

This account is highly misleading. They did NOT send signals faster than light; they exploited a strange medium that permitted them to "invert" the leading edge and the trailing edge of the signal envelope so the trailing edge came out of the medium before the leading edge. There was a lot of hoo-hah about the experiment at the time (2000) and it was eventually straightened out. Relativity does not allow massive objects to travel faster than light.

That said, in an ordinary medium like water light is slowed down, and there it is possible for a fast moving particle to outstrip its own light. When that happens you get an optical equivalent of the sonic boom that accompanies breaking the sound barrier. This is called "Cerenkov radiation"
(the C in Cerenkov is supposed to have a little v-mark over it to indicate it's pronounced like the ch in chair: CHAIR-en-koff).
 
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Thanks for the information guys, this proves to be very interesting indeed.
 

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