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- Thread starter Quantumgravity
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Asher Peres, "Relativistic telemetry,"

Peter Kenny, "Time dilation in special relativity: an alternative derivation,"

Physics Education 41(4), 334-336 (2006).

I find the last paper very transparent.

Being intertested in the field, I will answer to any further question you may have,concerning the subject, which could clarify my own bewilderment! Have a look please at the thread I started "Radar echo and clock synchronization".

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The Doppler factor (not to be confused with the Doppler shift) is [tex] k=e^\theta[/tex], and the time-dilation factor [tex] \gamma=\cosh\theta=\frac{1}{2}(e^\theta+e^{-\theta})[/tex].

So, [tex]\gamma=\frac{1}{2}(k+k^{-1})[/tex]. Similarly, it's easy to write down the velocity using [tex]v=c \tanh\theta[/tex].

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Robphy, thank you for the formula. I will need to do some research to fully understand it however.

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Rapidity is developed in part 3 of Chapter 1.

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I enjoyed the reading very much. I understand the math a bit better now.

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When we measure a source that emits red or blueshifted light we have to take the following three factors into account:

1. The relative speed between the emmitted and absorbed source.

2. The gravitational potential difference between the emmitted and absorbed source.

3. The expansion of space-time.

So if we

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Explain please what do you mean by expansion of space-time and what is its connection with the discussed problem. Thanks.When we measure a source that emits red or blueshifted light we have to take the following three factors into account:

1. The relative speed between the emmitted and absorbed source.

2. The gravitational potential difference between the emmitted and absorbed source.

3. The expansion of space-time.

So if weonlyknow the actual red- or blueshift then we cannot conclusively determine the amount of time dilation.

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