Recent content by Boustrophedon

You've missed the point. The SR kinematical time dilation can be (and was by H&K and subsequent authors) treated independantly of the gravitational effect, which in this instance is irrelevant to O S Richert's question concerning the supposed absence of time reciprocity between rotating clocks...

There seems to be a fair bit of confusion here. Surely the essential point is that unlike uniform linear motion, rotation is not a relative attribute, as even Newton with his spinning bucket was aware, and consequently a rotating clock is not equivalent to a non-rotating one. It will traverse a...

Yes. Er, no. I think you mean to say C(x) is stopped at +x/c, otherwise the clocks would not synchronise. In any case your method requires that x be already known for each clock, and the only practicable way of establishing this is with a to-and-fro light signal between already...

Yes it is, for a finite number of clocks. Having established from a given clock by pairwise signalling, the round trip light signal time to every other clock, a series of synchronising signals is sent to each specific clock at zero minus [half the round trip time for that clock], upon receipt of...

I do not believe, and have not said I believe, either of the "not really" and "really" notions you impute to me. One has to be careful, and rather subtle, with the terms 'real/not real' in SR. In SR the constant to-and-fro speed of light necessarily produces a symmetrically relative...

Now you're drifting into semantics. The time interval seems shorter because B's units of time, that is to say the 'ticks' on a B clock, have become longer, or dilated. If some clock is running at a slower rate than my clock it means that the concept of "a minute" or "the duration represented by...

Bravo ! A penetrating example of how the meaning of the 'Lorentz' transformations differs markedly between the two theories. However, I think your "misnomer" is misplaced... The inconsistency between time 'dilation' and length 'contraction' stems from the contrary way they are derived from...

"c+v" and "c-v" are the foundations of the subject I would like to point out that the whole of special relativity is based upon just such additions as 1/(c+v) + 1/(c-v) - as exemplified in section 3 of Einstein's 1905 paper. It is precisely these formulae for relatively moving observers, where...

Assuming you mean 26 years experienced by the explorers means a journey of 20 lightyears in 25 years or 4 lightyears in 5 years. So 4/v is the "stationary" time which is also equal to gamma times travel time = 5.gamma. Thus 4.sqrt(1-v.v) = 5v and hence 41 v squared equals 16 which gives a v =...

Of course you're right that the flashes cannot possibly travel at speed c.c/v. If you have quoted the problem correctly it is clearly misleading since as v approaches zero the velocity would become infinite. Rindler is either confused or being confusing. Two different simultaneous flashes along...

The answer to the two photon distance question can be obtained more simply and fully by emitting the photons from the same point in S, a time L/c apart. From S' the clocks in S run slow so the time in S' will be gamma.L/c corresponding to a distance gamma.L. During this time the point of...

Clarifying Einstein synchronisation Simple. It will be 3:30 in the afternoon. Einstein synchronisation means that if a light signal is sent from A to B and instantly returned back to A then B's clock at the moment of reception/return is set to half way between A's emission time and reception...

You've missed the crux of the issue. Considering a single point A is no good - it will feel no force regardless of whether it's free falling in a "uniform" field or a "normal" non-uniform one. A uniform field is defined as one in which the equivalence principle holds exactly over an extended...

You mean - ...in a region where the Riemann curvature tensor is not zero, surely !?

I don't quite see in what way I've 'changed tunes' - perhaps you might amplify ? What I have abbreviated to the 'indistinguishabilty condition' is that the equivalence of a uniformly accelerated reference frame and a 'uniform gravitational field' is such that a laboratory in either situation...