Re: [SR] The traveler of Tau Ceti

Le 28/03/2024 à 20:54, Volney a écrit :

On 3/28/2024 7:02 AM, Richard Hachel wrote:

Rapidity can take on any real value, the rapidity of light moving at c is infinite.

 This is absolutely obvious.
For 40 years, I have thought at length about all these problems of special relativity, because I am naturally curious, and I find it stupid to learn notions by heart without understanding them, or without being sure that they are correct.
When we understand things correctly, after 40 years of reflection, we realize that it is always very difficult to teach what we have understood, because of two things: the enormous a priori (that is to say stupidity and human ignorance), and intellectual violence (i.e. arrogance in front of a man who understands things better, and who explains them differently).
It is then very very difficult to speak and explain, especially when it seems "a little crazy".
Let's take accelerated frames of reference, and return to the problem studied by Paul B. Andersen. Is the observable speed of a mobile invariant in a frame of reference? We will find the question absolutely absurd. However, what is true in a Galilean frame of reference is no longer true in an accelerated frame of reference, and this is very strange when one is not prepared to understand it.
It seems absurd, and I myself didn't believe it for a long time, saying to myself: "It's absurd, I'm wrong." Speed cannot change depending on position.
However, my calculations were correct, the traditional observable speed Vo VARIES depending on the position in certain frames of reference.
This is precisely because these speeds are not real, but illusions.
If I study, for example, the traveler of Tau Ceti in accelerated mode,
and in real speed there is no problem, the real speed remains perfectly consistent.
But not the observable speed, and that is NORMAL since it is only an illusion due to measurements made by watches located in different places.
Let's ask Paul, who is one of the best posters on usenet, and ask him what the observable speed of a rocket crossing Tau Ceti located at 12 ly will be.
a=1.052 (10m/s²)
It will say 0.997c.
This is false Vo=0.980c
We can calculate it directly with:
<http://news2.nemoweb.net/jntp?JpQ45DGZXSvcO3qB1xXWEJE5_U4@jntp/Data.Media:1>
R.H.