Twin Paradox & Bondi K-Calculus: Who's Younger?

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Discussion Overview

The discussion revolves around the Twin Paradox and the application of Bondi K-Calculus, specifically focusing on how the age difference between two twins, A and B, is perceived depending on who sends the signal during their journey. The scope includes theoretical considerations and interpretations of relativistic effects.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants propose that Bondi K-Calculus is dependent on who sends the signal, suggesting that if twin A sends a signal to twin B, A will perceive B as younger after the journey, and vice versa.
  • Others challenge this interpretation, requesting detailed workings to identify potential errors in the reasoning presented.
  • There is a call for more details regarding the scenario, particularly whether the twins are compared while at different locations or at the same location after one has turned around.
  • Some participants emphasize the importance of standard approaches in physics, suggesting that deviations from these may indicate a misunderstanding rather than a flaw in the established methods.

Areas of Agreement / Disagreement

Participants express disagreement regarding the interpretation of Bondi K-Calculus in the context of the Twin Paradox, with no consensus reached on the correct application of the theory or the implications of signal sending.

Contextual Notes

Limitations include the lack of specific details about the journey and the conditions under which the twins are compared, as well as the assumptions made about the symmetry of the scenario.

Mohammad Fajar
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Bondi K-Calculus very depend on who was send the signal. If two twin A and B make a journey, A send a signal and B receiving the signal then yes after the journey A will see B younger, and this applied too for the case B sending a signal and A reflecting, then after the journey A will younger.
 
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This is wrong. Please post your working in detail and we can work out where you went wrong.
 
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Mohammad Fajar said:
If two twin A and B make a journey
You need more details here too
 
Dale said:
You need more details here too
True. I assumed he was talking about a twin paradox scenario. If there's no return leg then the situation may well be symmetric.
 
Mohammad Fajar said:
Bondi K-Calculus very depend on who was send the signal.
One thing that you need to understand from the outset is that standard approaches are standard for a reason: they work. If you think that you have found a mistake in a standard approach then >99% it is your mistake. Please post accordingly. For example “When I try to use Bondi K-Calculus somehow it seems to depend on who sends the signal”
 
Mohammad Fajar said:
Bondi K-Calculus very depend on who was send the signal. If two twin A and B make a journey, A send a signal and B receiving the signal then yes after the journey A will see B younger, and this applied too for the case B sending a signal and A reflecting, then after the journey A will younger.

Some more details on the scenario are needed. Are you comparing A and B when they are at different locations (travelling away from each other), or are you comparing them when they're both at the same location (which implies that one of them turns around).
 

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