Will O' Clocks Show Different Times?

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Discussion Overview

The discussion revolves around the observation of clocks in a moving reference frame O' from a stationary observer in frame O. Participants explore whether all clocks in frame O' will show different times when observed from O, considering factors such as synchronization, the relativity of simultaneity, and the effects of light travel time.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • Some participants assert that all clocks in frame O' will show different times when observed from frame O.
  • Others argue that some clocks may show the same time, particularly those situated on a plane perpendicular to the direction of motion.
  • A participant questions the meaning of "I look," suggesting that the interpretation affects the observation of clock times.
  • There is mention of the time delay due to the finite speed of light, which could influence the perceived times of clocks at different distances.
  • Some participants emphasize the need for precise language in discussing simultaneity and observation in relativity.
  • One participant refers to a specific paper that illustrates the relativity of simultaneity, suggesting it may provide insight into the discussion.
  • Another participant notes that under ideal conditions, only some clocks in O' will show different times according to the observer in O.

Areas of Agreement / Disagreement

Participants do not reach a consensus. There are competing views on whether all clocks will show different times or if some may be synchronized, and the discussion remains unresolved regarding the implications of light travel time and simultaneity.

Contextual Notes

Limitations include assumptions about ideal conditions, the definitions of simultaneity, and the effects of relativistic physics versus classical interpretations. The discussion also highlights the complexity of observing events across different reference frames.

  • #31
Suppose O' is a frame that observes an infinite grid with all the clocks synchronized to O' itself.

Now, O is a frame (me) who has a relative speed with respect to O' (thus all the other clocks of the grid as well)

How will my observation of the times be affected by my motion?
Specifically, suppose the origin (both space and time) was the event when O' and O touched each other

Assuming O is going towards the x-axis of the grid, what will the observed time of a general grid point be according to O?
 
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  • #32
aberrated said:
Suppose O' is a frame that observes an infinite grid with all the clocks synchronized to O' itself.

Now, O is a frame (me) who has a relative speed with respect to O' (thus all the other clocks of the grid as well)

Further let the x-axes of the two grids be parallel, likewise for the y- and z-axes, and let the relative speed v of O' with respect to O be in the +x direction.

How will my observation of the times be affected by my motion?
Specifically, suppose the origin (both space and time) was the event when O' and O touched each other

I assume you mean that the origins (x=y=z=0 points) of the two grids coincide at t=t'=0.

Then two clocks whose x'-coordinates differ by \Delta x' in O' (and which are synchronized in O'), will be observed in O to be out of synchronization by an amount

\Delta t' = \frac{v \Delta x'}{c^2}

with the clock that is in the "forward" position (with respect to the motion of the clocks in O), having a reading that is behind the other one.

So if the clocks are 1 light-second apart in O', and are moving at 0.5c (0.5 light-seconds per second) in O, then in O they will be observed to have readings that are 0.5 second apart, and decreasing as you proceed in the +x direction. All O' clocks with the same x' but different y' and z' will have the same reading in O.
 

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