Do Particles at LHC Travel Near Light Speed?

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Discussion Overview

The discussion centers around the behavior of particles at the Large Hadron Collider (LHC) as they approach the speed of light, particularly regarding the effects of time dilation and the implications of relativistic velocity addition. Participants explore theoretical concepts related to relativity and Newtonian mechanics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether particles at the LHC are affected by time dilation due to their near-light-speed travel and raises concerns about the cumulative effects of various motions (planetary, solar, galactic) on their speed.
  • Another participant asserts that time does slow down for particles moving at high speeds, citing the observation that such particles decay more slowly than when at rest.
  • A participant draws an analogy between jumping on a moving train and the behavior of particles, questioning why they do not experience a force pushing them backward when they jump.
  • In response, another participant clarifies that the lack of backward force when jumping on a train is due to Newton's first law, explaining that both the jumper and the train share the same velocity, and discusses the differences in velocity addition between Newtonian mechanics and relativity.

Areas of Agreement / Disagreement

Participants express differing views on the implications of relativistic effects and the nature of velocity addition, indicating that multiple competing perspectives remain without consensus.

Contextual Notes

Participants reference the complexities of relativistic physics and Newtonian mechanics, highlighting the need for careful consideration of reference frames and the effects of high velocities, but do not resolve the implications of these discussions.

Benplace
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If particles at the LHC are traveling very near the speed of light, are they affected by the slowness of time?
Also, how can they travel near the speed of light when the planet is rotating around the sun and the solar system is traveling around the galaxy and the galaxy is moving through space, wouldn't those put the particles over the universal speed limit?
 
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Yes, time will go slower for the particles (this can be seen because particles that are going at such speeds decay slower than if they were at rest).

And no, a consequence of relativity is that velocities do NOT add like intuition suggests: 0.9c + 0.9c =/= 1.8c.
 
Is that why when traveling on a train and you jump in the air you don't get slammed into the car behind you?
 
No, that's just a consequence of Newton's first law. In the case of the train, you and the train both have the same velocity. When you jump, there's no horizontal force on you that would slow you down, so you keep going horizontally with the same velocity (objects in motion will continue along their path unless acted on by an outside force).

What I mean is, in Newtonian mechanics, if I'm traveling in a car at 50 mph, and another car is traveling in the opposite direction going 50 mph, then we can add velocities directly and say that in my reference frame, I am at rest, and they're traveling at 100 mph. In relativity, however, velocities do not add like this. It just doesn't show for velocities low compared to the speed of light. Taking relativity into account, if I declare that I am at rest, the other car actually looks like it's going 99.9999999 mph as opposed to 100--in other words, velocity addition doesn't work the same in relativity.
 

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