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TWIN PARADOX OR TWIN ABSURDITY?
"Peter Webb" wrote in message u... | | | | So you don't believe in Relativity's predictions concerning the twin | | paradox? | | | ‘By denying scientific principles, one may maintain any paradox.’ — | Galileo | Galilei | | | Funny you won't answer a simple question about what you believe. Why is | that? Do you believe Australia and Canada interfered in Kuwait? Why did they do that? Funny you won't answer a simple question about what you believe. Why is that? |
#112
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TWIN PARADOX OR TWIN ABSURDITY?
Hard times for Divine Albert's Divine Absurdities:
http://www.citeulike.org/article/8163639 Popper's response to Dingle on special relativity and the problem of the observer, by: Peter Hayes Studies In History and Philosophy of Science Part B: Studies In History and Philosophy of Modern Physics (30 October 2010) Abstract Dingle contended that Einstein's special theory of relativity was physically impossible for the simple reason that it required clocks to be simultaneously faster and slower than each other. McCrea refuted Dingle using an operationalist argument. An operational response did not satisfy Popper, who wrote an unpublished essay to counter Dingle's claim. Popper developed an analysis that avoided operationalism by using a system of coinciding clocks, contending that this system showed that special relativity withstood Dingle's criticism that it was not a symmetrical and consistent physical theory. However, Popper mistakenly included an asymmetric calculation in his analysis. Once this is corrected, the amended result supports Dingle's position. Popper went on to argue that to avoid determinism, special relativity had to be reconciled with absolute time; this too supports Dingle. Popper's failure to refute Dingle calls into question his claim that 'the observer' is superfluous to special relativity. Pentcho Valev wrote: http://www.bartleby.com/173/23.html Albert Einstein: "The observer performs experiments on his circular disc with clocks and measuring-rods. In doing so, it is his intention to arrive at exact definitions for the signification of time- and space-data with reference to the circular disc K', these definitions being based on his observations. What will be his experience in this enterprise? To start with, he places one of two identically constructed clocks at the centre of the circular disc, and the other on the edge of the disc, so that they are at rest relative to it. We now ask ourselves whether both clocks go at the same rate from the standpoint of the non-rotating Galileian reference-body K. As judged from this body, the clock at the centre of the disc has no velocity, whereas the clock at the edge of the disc is in motion relative to K in consequence of the rotation. According to a result obtained in Section XII, it follows that the latter clock goes at a rate permanently slower than that of the clock at the centre of the circular disc, i.e. as observed from K." Is it true that "according to a result obtained in Section XII, it follows that the latter clock goes at a rate permanently slower than that of the clock at the centre of the circular disc, i.e. as observed from K "? That is, do the Lorentz tranformations predict that the non- rotating clock (at the centre of the disc) runs FASTER than the rotating clock (at the edge of the disc)? If the Lorentz transformations do not predict anything like that, why is Einstein lying? http://homepage.ntlworld.com/academ/...elativity.html "A more intriguing instance of this so-called 'time dilation' is the well-known 'twin paradox', where one of two twins goes for a journey and returns to find himself younger than his brother who remained behind. This case allows more scope for muddled thinking because acceleration can be brought into the discussion. Einstein maintained the greater youthfulness of the travelling twin, and admitted that it contradicts the principle of relativity, saying that acceleration must be the cause (Einstein 1918). In this he has been followed by relativists in a long controversy in many journals, much of which ably sustains the character of earlier speculations which Born describes as "monstrous" (Born 1956). Surely there are three conclusive reasons why acceleration can have nothing to do with the time dilation calculated: (i) By taking a sufficiently long journey the effects of acceleration at the start, turn-round and end could be made negligible compared with the uniform velocity time dilation which is proportional to the duration of the journey. (ii) If there is no uniform time dilation, and the effect, if any, is due to acceleration, then the use of a formula depending only on the steady velocity and its duration cannot be justified. (iii) There is, in principle, no need for acceleration. Twin A can get his velocity V before synchronizing his clock with that of twin B as he passes. He need not turn round: he could be passed by C who has a velocity V in the opposite direction, and who adjusts his clock to that of A as he passes. When C later passes B they can compare clock readings. As far as the theoretical experiment is concerned, C's clock can be considered to be A's clock returning without acceleration since, by hypothesis, all the clocks have the same rate when at rest together and change with motion in the same way independently of direction. [fn. I am indebted to Lord Halsbury for pointing this out to me.] (...) The three examples which have been dealt with above show clearly that the difficulties are not paradoxes) but genuine contradictions which follow inevitably from the principle of relativity and the physical interpretations of the Lorentz transformations. The special theory of relativity is therefore untenable as a physical theory." The following scenario will show that the travelling twin will find himself OLDER than his brother who remained behind. A long rocket passes the twin at rest, and the rocket is so long that the twin at rest will see it passing by all along. According to Einstein's special relativity, observers in the rocket see their clocks running faster than the twin at rest's clock, that is, observers in the rocket age faster than the twin at rest. At some initial moment the travelling twin, standing so far next to his brother, jumps into the rocket, joins the observers there and starts, just like them, aging faster than the twin at rest. Later the rocket stops and immediately starts moving in the opposite direction. Again, according to Einstein's special relativity, observers in the rocket, including the travelling twin, age faster than the twin at rest. Finally the travelling twin jumps out of the rocket and rejoins his brother at rest. Who is older? Pentcho Valev |
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