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From: Athel Cornish-Bowden <me@yahoo.com>
Newsgroups: sci.physics.relativity
Subject: Re: Oh my God!
Date: Wed, 25 Sep 2024 17:57:46 +0200
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On 2024-09-25 15:34:35 +0000, gharnagel said:

> On Wed, 25 Sep 2024 10:28:12 +0000, Athel Cornish-Bowden wrote:
>> 
>> On 2024-09-25 00:27:09 +0000, Richard Hachel said:
>>> 
>>> I stumbled upon this on Wikipedia...
>>> 
>>> I don't know whether to laugh or cry...
>>> 
>>> Did you see where Minkowski places his simultaneity plans?
>>> 
>>> But that's not it!!!
>>> 
>>> That's not it AT ALL!!!
>>> 
>>> 
>> <http://nemoweb.net/jntp?Ev7wMrtKlxguxDn1RDUke8-o3Zo@jntp/Data.Media:1>
>> 
>> That's clearly not Minkowski's diagram (did he have suitable drawing
>> software in the 19th century?), but someone's interpretation of it. I
>> hope you're not adopting Thomas Heger's habit of lying about who wrote
>> what.
>> 
>>> With a huge dust under the carpet right in the middle (the stupid
>>> time-gap of physicists).
>>> 
>>> It's depressing.
>>> 
>> --
>> athel -- biochemist, not a physicist, but detector of crackpots
> 
> Actually, it might be correct.

Yes, but it's still not something drawn by Minkovski.

>   Contrary to what Hachel wrote, there
> is no "gap."  The presumption in the figure is that the velocities
> going and returning are constant with an infinite deceleration at
> the turning point.  Realistically, the deceleration would be finite.
> Consequently, the simultaneous line would move smoothly from the
> point intersecting the vertical line and the upper blue line to a
> horizontal line between the turning point and the vertical line
> (representing "home").  As the ship began its return journey, the
> simultaneous line would move up to the lower red line as depicted.
> The movement through the gap can be as swift as desired (a particle
> in an accelerator encountering a target would have a very fast
> deceleration, but still not infinite).


-- 
athel -- biochemist, not a physicist, but detector of crackpots