Date: Thu, 11 Jul 2024 20:55:24 +0200
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Subject: Re: Langevin's paradox again
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W dniu 11.07.2024 o 20:29, Richard Hachel pisze:
> Le 11/07/2024 à 16:09, ram@zedat.fu-berlin.de (Stefan Ram) a écrit :
>>
>>   From the perspective of the twin chilling back on Earth, the
>>   traveling twin is getting the time dilation treatment the whole time,
>>   so he ages way less. That part's a no-brainer. But now let's flip
>>   the script and look at it /from the traveling twin's point of view/:
>>
>>   When the traveling twin bounces from Earth (I'm assuming
>>   constant velocity for simplicity), time on Earth starts slowing
>>   down for them. Not like, looking through a telescope slow,
>>   but like, the time between two moments on Earth that line up
>>   with a single second on the spaceship is actually less than a
>>   second. Trippy, right?
>>   Then when the traveling twin boomerangs back to Earth, time is
>>   still dragging for them. That's the time dilation working its
>>   magic - independent of the direction of the movement.
>>
>>   So the traveling twin should be thinking his Earth-bound bro is
>>   aging slower. But somehow, it's the opposite - the Earth twin is
>>   looking way more mature. What gives? Could it have something to do
>>   with that quick boost in the middle to flip the script and head back?
>>
>>   This is the question that's been stumping everyone, but get
>>   this - I found the answer last year in some old Einstein text.   
>> Here's how it breaks down:
>>
>>   The traveler thinks of himself as stationary and unaccelerated. But
>>   how does he keep that mindset when the engines are blasting during
>>   the turnaround? It's like there's a uniform gravitational field
>>   filling the whole space - the engines are just keeping the ship from
>>   falling in it, so it stays at rest!
>>   So if the traveler sees himself as at rest during that acceleration,
>>   a uniform gravitational field is filling the whole space for him.
>>
>>   In this field, the traveler and Earth twin are at totally different
>>   potentials (and the farther apart, the bigger the difference).
>>   This potential gap makes time on Earth zoom by so fast, it more
>>   than makes up for the slowdown on the outbound and return legs!
>>
>>   And that's why, /also from the traveler's point of view/, more time
> 
> But no!!!
> 
> Damn, what are you all doing on sci.physics.relativity talking loads of 
> bullshit?
> 
> The problem is not there at all, and here is one (which seems to come 
> from Germany) who didn't understand anything more.
> 
> Damn it! Breathe in, breathe out!
> 
> This is not AT ALL what is happening. The U-turn, absolutely nothing 
> happens on TIMES, but only on spaces (and only in Stella's frame of 
> reference).
> 
> Breathe in, breathe out!
> 
> All this is the fault of this idiot Python, who has been completely 
> ruining the scientific forums for thirty years by spitting on posters as 
> soon as he sees one that does not seem to him to be in conformity.
> 
> And we end up with posts as stupid as this one.
> 
> I repeat, during the U-turn, nothing happens at all on the TIME side.
> 
> For Terrence to stay on earth, he observed in his ultra-powerful 
> telescope Stella traveling an immense semi-circle at the tangential 
> speed of 0.8c, and returning to earth.
> 
> We admit that the rocket can withstand these terrible accelerations,
> and Terrence observes that the U-turn takes place in 40 hours.
> 
> For Stella, the clean time is shorter, only 24 hours.
> 
> The effect is absolute.
> 
> Once this is understood, we see that it all fits together very well, and 
> that there is no need to imagine useless unicorns.
> 
> But what happens during this U-turn for Terrence?
> He ages by 40 hours, and observes that his sister ages by 24 hours 
> between the moment she begins the U-turn, and the moment she completes 
> her U-turn.
> 
> FOR Stella, it's exactly the same thing, when she begins her U-turn, her 
> clock marks 9 years, and she sees over there (direct-live) Terrence's 
> clock marks three years.
> 
> When she finishes her U-turn, she has aged 24 hours, and she sees the 
> earth clock which still marks three years (plus 40 hours).
> 
> Nothing special happens.
> 
> And those who say that something is happening (like gap-time) are morons 
> who don't understand the theory.
> 
> Being an idiot who doesn't understand doesn't matter, personally I 
> remained an idiot for decades before I got the hang of it and was able 
> to write an SR of perfect logic and perfect beauty.


And in the meantime in the real world, improper clocks
keep measuring improper t'=t in improper seconds.
Common sense was warning your idiot guru.