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RELATIVITY PARADOXES ARE ABSURDLTIES, DON'T YOU SEE?



 
 
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  #1  
Old March 22nd 13, 08:52 AM posted to sci.astro
Pentcho Valev
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Default RELATIVITY PARADOXES ARE ABSURDLTIES, DON'T YOU SEE?

http://news.wustl.edu/news/Pages/25011.aspx
"April 27: Dr. Kasey Wagoner, lecturer in physics, will discuss "Pole vaulters and Barns." In 1905 Albert Einstein put forth his earth-shaking theory of Special Relativity. Einstein's seemingly unremarkable assertion that the speed of light must be constant had many remarkable effects. Included in these effects are length contraction (moving objects are shorter than objects at rest) and time dilation (moving clocks tick slower than clocks at rest). Given such odd predictions it is easy to see how the theory of Special Relativity can lead to many paradoxes. In this lecture we will explore one such paradox, which concerns a pole vaulter who wants to store his pole in a barn shorter than his pole is long, and walk away with an explanation even Einstein could understand."

Any irony coming from Einsteinians is absolutely inappropriate. The long-pole-trapped-inside-short-barn absurdity (to use a mild word), a direct consequence of Einstein's 1905 false light postulate, and the almost complete silence that has surrounded it for a century, are just tragic symptoms of an irreversibly dying science:

http://www.amazon.com/Faster-Than-Sp.../dp/0738205257
Joao Magueijo, Faster Than the Speed of Light, p. 250: "Lee [Smolin] and I discussed these paradoxes at great length for many months, starting in January 2001. We would meet in cafés in South Kensington or Holland Park to mull over the problem. THE ROOT OF ALL THE EVIL WAS CLEARLY SPECIAL RELATIVITY. All these paradoxes resulted from well known effects such as length contraction, time dilation, or E=mc^2, all basic predictions of special relativity. And all denied the possibility of establishing a well-defined border, common to all observers, capable of containing new quantum gravitational effects."

http://math.ucr.edu/home/baez/physic...barn_pole.html
"These are the props. You own a barn, 40m long, with automatic doors at either end, that can be opened and closed simultaneously by a switch. You also have a pole, 80m long, which of course won't fit in the barn. (...) If it does not explode under the strain and it is sufficiently elastic it will come to rest and start to spring back to its natural shape but since it is too big for the barn the other end is now going to crash into the back door and the rod will be trapped IN A COMPRESSED STATE inside the barn."

http://www.quebecscience.qc.ca/Revolutions
Stéphane Durand: "Ainsi, une fusée de 100 m passant à toute vitesse dans un tunnel de 60 m pourrait être entièrement contenue dans ce tunnel pendant une fraction de seconde, durant laquelle il serait possible de fermer des portes aux deux bouts! La fusée est donc réellement plus courte.. Pourtant, il n'y a PAS DE COMPRESSION matérielle ou physique de l'engin.."

http://www.parabola.unsw.edu.au/vol3...ol35_no1_2.pdf
"Suppose you want to fit a 20m pole into a 10m barn. (...) Hence in both frames of reference, the pole fits inside the barn (and will presumably shatter when the doors are closed)."

Note that the long-pole-trapped-inside-short-barn assumption is indispensable if one wishes the Michelson-Morley experiment to confirm the constant speed of light and refute the variable speed of light predicted by Newton's emission theory of light. The thought:

"No an arbitrarily long object cannot be trapped inside an arbitrarily short container - this is absurd!"

....inevitably leads to the conclusion that the Michelson-Morley experiment unequivocally refuted the constant speed of light and confirmed the variable speed of light predicted by Newton's emission theory of light:

http://www.amazon.com/Relativity-Its.../dp/0486406768
Relativity and Its Roots, Banesh Hoffmann: "Moreover, if light consists of particles, as Einstein had suggested in his paper submitted just thirteen weeks before this one, the second principle seems absurd: A stone thrown from a speeding train can do far more damage than one thrown from a train at rest; the speed of the particle is not independent of the motion of the object emitting it. And if we take light to consist of particles and assume that these particles obey Newton's laws, they will conform to Newtonian relativity and thus automatically account for the null result of the Michelson-Morley experiment without recourse to contracting lengths, local time, or Lorentz transformations. Yet, as we have seen, Einstein resisted the temptation to account for the null result in terms of particles of light and simple, familiar Newtonian ideas, and introduced as his second postulate something that was more or less obvious when thought of in terms of waves in an ether."

Needless to say, the thought referred to above would never occur in ordinary Einsteinians' minds:

http://ebooks.adelaide.edu.au/o/orwe...hapter2.9.html
"Crimestop means the faculty of stopping short, as though by instinct, at the threshold of any dangerous thought. It includes the power of not grasping analogies, of failing to perceive logical errors, of misunderstanding the simplest arguments if they are inimical to Ingsoc, and of being bored or repelled by any train of thought which is capable of leading in a heretical direction. Crimestop, in short, means protective stupidity."

Pentcho Valev
  #2  
Old March 22nd 13, 01:49 PM posted to sci.astro
Pentcho Valev
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Default RELATIVITY PARADOXES ARE ABSURDLTIES, DON'T YOU SEE?

The travelling twin possesses two synchronized clocks - one (A) at the front end and the other (B) at the back end of a very long spaceship moving with constant speed towards the sedentary twin. As A passes the sedentary twin, the latter sets his clock to read the same as A. According to special relativity, when later B passes the sedentary twin, B shows more time elapsed than the sedentary twin's clock. That is, special relativity predicts that, as the travelling twin performs the forward part of the trip, he measures the sedentary twin's clock to run SLOWER than his own.

In this scenario things are so planned in advance by the travelling twin that, at the moment B reaches the sedentary twin's clock, the spaceship stops and both A and B stop ticking (simultaneously as judged in the spaceship). The sedentary twin's clock is also stopped by adjacent B. In this pause between the forward and the backward part of the trip, A and B read the same and the sedentary twin's clock reads less. This is what special relativity predicts if measurements are done in the travelling twin's (inertial) system.

Einsteinians,

Do you agree that, in the pause between the forward and the backward part of the trip as defined above, both twins see less time elapsed on the sedentary twin's clock than on A and B? Can you suggest a scenario for the remaining backward part of the trip (with B at the front end and A at the back end of the spaceship) such that, when A and the sedentary twin's clock meet at the end, the latter shows more time elapsed than A, Divine Einstein, yes we all believe in relativity, relativity, relativity?

Pentcho Valev
  #3  
Old March 22nd 13, 04:38 PM posted to sci.astro
Pentcho Valev
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Posts: 8,078
Default RELATIVITY PARADOXES ARE ABSURDLTIES, DON'T YOU SEE?

http://www.amazon.com/Relativity-Its.../dp/0486406768
Relativity and Its Roots, Banesh Hoffmann, p. 105: "In one case your clock is checked against two of mine, while in the other case my clock is checked against two of yours, and this permits us each to find without contradiction that the other's clocks go more slowly than his own."

Since the travelling twin has to shift his frame of reference, it is technically difficult (but not impossible) to show how the travelling twin checks the sedentary twin's clock against his own and find, in accordance with special relativity, that the sedentary twin proves younger at the end of the trip. This technical difficulty allowed Einsteinians to introduce the following victorious principle:

We, Honest Einsteinians, show that, as judged from the frame of the sedentary twin, the travelling twin's clock runs slow, Divine Einstein, yes we all believe in relativity, relativity, relativity. We don't care about any means by which the travelling twin can check the sedentary twin's clock against his own. And since we do not care, the problem simply does not exist, Divine Einstein, yes we all believe in relativity, relativity, relativity.

The problem did not exist for Divine Albert in 1911 so his only concern was to minimize the effects of the acceleration suffered by the travelling twin:

http://www.informaworld.com/smpp/con...ent=a909857880
Peter Hayes, in "The Ideology of Relativity: The Case of the Clock Paradox" : Social Epistemology, Volume 23, Issue 1 January 2009, pages 57-78, quotes Einstein writing in 1911: "The [travelling] clock runs slower if it is in uniform motion, but if it undergoes a change of direction as a result of a jolt, then the theory of relativity does not tell us what happens. The sudden change of direction might produce a sudden change in the position of the hands of the clock. However, the longer the clock is moving rectilinearly and uniformly with a given speed in a forward motion, i.e., the larger the dimensions of the polygon, the smaller must be the effect of such a hypothetical sudden change."

The acceleration-is-unimportant thesis is taught even today:

http://www.damtp.cam.ac.uk/research/...tivity2010.pdf
Gary W. Gibbons FRS: "In other words, by simply staying at home Jack has aged relative to Jill. There is no paradox because the lives of the twins are not strictly symmetrical. This might lead one to suspect that the accelerations suffered by Jill might be responsible for the effect. However this is simply not plausible because using identical accelerating phases of her trip, she could have travelled twice as far. This would give twice the amount of time gained."

Yet Divine Albert's enemies constantly referred to the fact that special relativity predicts RECIPROCAL time dilation so in 1918 he had to abandon the acceleration-is-unimportant thesis: Yes, the travelling twin does see the sedentary twin's clock running slow when the velocity is uniform but the acceleration suffered by the travelling twin at the turn-around counteracts the effect so that in the end Divine Albert's 1905 prediction (the travelling twin returns younger), even though made without any reference to acceleration, remains gloriously valid:

http://en.wikisource.org/wiki/Dialog...f_rela tivity
Dialog about Objections against the Theory of Relativity (1918), by Albert Einstein: "...according to the special theory of relativity the coordinate systems K and K' are by no means equivalent systems. Indeed this theory asserts only the equivalence of all Galilean (unaccelerated) coordinate systems, that is, coordinate systems relative to which sufficiently isolated, material points move in straight lines and uniformly. K is such a coordinate system, but not the system K', that is accelerated from time to time. Therefore, from the result that after the motion to and fro the clock U2 is running behind U1, no contradiction can be constructed against the principles of the theory. (...) During the partial processes 2 and 4 the clock U1, going at a velocity v, runs indeed at a slower pace than the resting clock U2. However, this is more than compensated by a faster pace of U1 during partial process 3. According to the general theory of relativity, a clock will go faster the higher the gravitational potential of the location where it is located, and during partial process 3 U2 happens to be located at a higher gravitational potential than U1. The calculation shows that this speeding ahead constitutes exactly twice as much as the lagging behind during the partial processes 2 and 4. This consideration completely clears up the paradox that you brought up."

http://www.pitt.edu/~jdnorton/teachi...yon/index.html
John Norton: "Then, at the end of the outward leg, the traveler abruptly changes motion, accelerating sharply to adopt a new inertial motion directed back to earth. What comes now is the key part of the analysis. The effect of the change of motion is to alter completely the traveler's judgment of simultaneity. The traveler's hypersurfaces of simultaneity now flip up dramatically. Moments after the turn-around, when the travelers clock reads just after 2 days, the traveler will judge the stay-at-home twin's clock to read just after 7 days. That is, the traveler will judge the stay-at-home twin's clock to have jumped suddenly from reading 1 day to reading 7 days. This huge jump puts the stay-at-home twin's clock so far ahead of the traveler's that it is now possible for the stay-at-home twin's clock to be ahead of the travelers when they reunite."

Pentcho Valev
 




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