Accelerating Particles > c: Special Relativity Considerations

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Discussion Overview

The discussion revolves around the implications of special relativity in the context of particle acceleration in a circular loop, specifically addressing whether acceleration can exceed the speed of light, c, and the validity of such scenarios within the framework of special relativity.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant proposes a scenario involving a particle accelerator where a particle moves at speed ≈ c and calculates an acceleration that appears to exceed c, questioning if this violates special relativity.
  • Another participant argues that acceleration is a rate of change of velocity and is dimensionally different from velocity, suggesting that comparing acceleration to c is meaningless.
  • A later reply reiterates the initial scenario and emphasizes that while speed cannot exceed c, there are no restrictions on acceleration, reinforcing the idea that acceleration and speed have different units.
  • There is a mention of the time and radius being defined from the electron's frame, which may influence the interpretation of the scenario.

Areas of Agreement / Disagreement

Participants express disagreement regarding the comparison of acceleration to the speed of light, with some asserting that such a comparison is invalid while others maintain that the scenario raises important questions about the limits of special relativity.

Contextual Notes

Participants do not resolve the implications of their arguments, and the discussion remains focused on the conceptual understanding of acceleration versus speed within the framework of special relativity.

Tigersharkmks
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consider a circular loop (a particle accelator). Suppose any particle moves their with speed ≈ c. Now let the radius be such that it completes loop in 1 sec. Therfore velocity at any postion in the loop is c with direction tangent to it. So consider two point A & B where they are at 90 degree to each other. So Δv = √2*c. Therfore acceleration in Δv/Δt = √2*c/0.25 (Since it had only traveled one-quatar of loop). Therfore acceleration is 4*1.44*c > c. So is it a violation of special relativity or such process is not possible or special relativity allows acceleration to be greater than c. Time & radius is given from electron's frame.
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Acceleration is rate of change in velocity as a function of time. It is dimensionally different from velocity, so comparing with c is meaningless. You can make it numerically as large as you want by changing the time dimension, say from seconds to nanoseconds.
 
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Tigersharkmks said:
consider a circular loop (a particle accelator). Suppose any particle moves their with speed ≈ c. Now let the radius be such that it completes loop in 1 sec. Therfore velocity at any postion in the loop is c with direction tangent to it. So consider two point A & B where they are at 90 degree to each other. So Δv = √2*c. Therfore acceleration in Δv/Δt = √2*c/0.25 (Since it had only traveled one-quatar of loop). Therfore acceleration is 4*1.44*c > c. So is it a violation of special relativity or such process is not possible or special relativity allows acceleration to be greater than c.
There is no such restriction on acceleration. It is speed that cannot be greater than c.
In fact, as mathman said, acceleration and speed have different units so it makes no sense to compare acceleration and c. That would be like saying an object "cannot be longer than c".

Time & radius is given from electron's frame.
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