Re: A short proof of the inconsistency of Einstein's physics

Le 11/04/2025 à 07:07, Thomas Heger a écrit :

The entire dammed 'twin paradox' should be dropped, because of the nonsense with the 'u-turn in 24 hours'.
 Actually light speed is hard to reach for humans, because a somehow acceptable acceleration of say two g would require a lifetime of acceleration.
 Now you would need another lifetime to stop at the far side and yet another one to accelerate again from there (plus an additional lifetime to stop again at planet Earth).
 TH

But no!
This is a thought experiment, so we can imagine anything.
Second, particles can have such instantaneous accelerations, and if we could test this on them, we would see that it works.
Third, we can stretch the problem by proposing a much longer trajectory. For example, we will no longer go around Tau Ceti (12 ly) in 24 hours of proper time and 40 hours of Earth time, but we will go around a star 1000 light-years away, for example.
The acceleration times will have very little impact if we assume an acceleration of 10 m/s² (Earth's gravity for a few months) until we obtain a constant velocity of 0.8 c. We can neglect the acceleration times, and on return, we will obtain a value for the ratio of due to the periods of uniform motion close to gamma = 1/0.6.
Each 60-year period in the rocket is equal to a period of 1,100 years on Earth.
But that's not the point, because these things are known. The important thing, when someone reads me, is to understand what is not currently known or well understood, such as the fact that at a speed of v=0.8c, the forward path expands three times, and the backward path contracts three times, which is logical and obvious if one correctly understands relativistic geometry.
And here, incredibly, in the 40 years I've been teaching it, no one is capable of understanding such a simple fact.
That's what's important: it's the human inability to grasp a concept that a 16-year-old student will easily grasp if I teach it to him, but which will completely baffle a Nobel Prize winner in theoretical physics.
R.H.