Making sure events are simultaneous in S'

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Discussion Overview

The discussion revolves around the problem of determining the timing of laser events to ensure simultaneity in the reference frame of an asteroid. Participants explore the implications of Lorentz transformations and the conditions under which events can be considered simultaneous across different reference frames.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant proposes defining events in the asteroid's reference frame (S') such that the laser hits the front and back of the asteroid at t' = 0 to analyze simultaneity.
  • Another participant agrees that this approach would work for determining when events must occur in the original reference frame (S) to ensure simultaneity.
  • A different participant expresses confusion when applying inverse Lorentz transformations, noting that the re-transformed events do not appear simultaneous in S', suggesting a potential error in their calculations.
  • In response, another participant asserts that the inverse transformation should return the original events, implying that an arithmetic error may have occurred in the calculations.

Areas of Agreement / Disagreement

Participants generally agree on the initial approach of defining events in S' for simultaneity analysis. However, there is disagreement regarding the outcome of applying inverse transformations, as one participant reports a discrepancy that remains unresolved.

Contextual Notes

The discussion highlights potential limitations in the application of Lorentz transformations, including the possibility of arithmetic errors and the dependence on the correct application of definitions related to simultaneity.

Shaybay92
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I have a problem where it requires me to find when a laser should be fired at an asteroid to ensure that in the reference frame of the asteroid, the laser hits the back and front within 1 millisecond. I thought that I could define events in S' such that the front and back are hit at t' = 0, and then see what events this would correspond to in S. Thus I would know when the events must happen in S to ensure simultaneity. Is this correct?
 
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Shaybay92 said:
I have a problem where it requires me to find when a laser should be fired at an asteroid to ensure that in the reference frame of the asteroid, the laser hits the back and front within 1 millisecond. I thought that I could define events in S' such that the front and back are hit at t' = 0, and then see what events this would correspond to in S. Thus I would know when the events must happen in S to ensure simultaneity. Is this correct?
Yes, that would work.
 
It seems logical to me, however when I try and use inverse lorentz transformations on those events to get the coordinates in S and then re-transform those S coordinates back into S' it says that those events are not simultaneous in S'. I thought this was a 'closed loop'. I should get the original events I defined back right?
 
Yes. That is what it means for a transform to be an inverse. You must have made an arithmetic error.
 

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