Faster than Light... Superluminal Group Velocity

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SUMMARY

The discussion centers on the concept of superluminal group velocities and their implications within the framework of general relativity (GR) and special relativity (SR). It references a specific paper on superluminal group velocities, highlighting that such phenomena do not violate the principles of GR or SR when observed in anomalous media. The key takeaway is that while group velocities may exceed the speed of light, no actual information or matter travels faster than light, reinforcing the established limits of physics. The consensus is that the notion of faster-than-light (FLT) travel is a myth, thoroughly debunked in the context of current scientific understanding.

PREREQUISITES
  • Understanding of general relativity (GR) principles
  • Familiarity with special relativity (SR) concepts
  • Knowledge of wave propagation in anomalous media
  • Ability to interpret scientific papers and experimental results
NEXT STEPS
  • Research the implications of superluminal group velocities in quantum mechanics
  • Study the experimental setups used in the NEC experiment
  • Examine the mathematical framework of wave detection in physics
  • Explore the historical context of superluminal claims in scientific literature
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Physicists, students of theoretical physics, and anyone interested in the boundaries of modern physics and the implications of superluminal phenomena.

ThunderLight
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If general relativity in the formal sense constrains all velocities to the speed of light as a maximum, how would superluminal group velocities exceeding speeds of light (at their superpositions) be evaluated in mainstream physics? Would this be a case of General Relativity and Physics principles Violation?

An example is a paper reporting superluminal group velocities measured:
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.88.073901
 
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This is an awfully old news. This, and the NEC experiment from way back (https://www.physicsforums.com/threa...n-the-speed-of-light.98696/page-2#post-819155) that has been discussed extensively on PF, are NOT breaking SR and GR. These are done in anomalous medium, and ... pay attention to this... no part of the wave moves faster than c!. This is why it is crucial to understand how we detect a wave, i.e. what part of the wave would have to reach us before we say we detect it.

Zz.
 
The question has been answered and there is no need to repeat a ten year old thread, which could as well be read instead.
FLT is a myth: debunked.

This thread is closed.
 

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