Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Athel Cornish-Bowden <me@yahoo.com>
Newsgroups: sci.physics.relativity
Subject: Re: Oh my God!
Date: Thu, 26 Sep 2024 17:09:32 +0200
Organization: A noiseless patient Spider
Lines: 40
Message-ID: <vd3tfc$7ni0$1@dont-email.me>
References: <Ev7wMrtKlxguxDn1RDUke8-o3Zo@jntp> <vd0ojs$3l9ep$1@dont-email.me> <a31f3991a821c8bf2f4230fdf13ee41c@www.novabbs.com> <vd1btr$3o5la$1@dont-email.me> <545631efc04039c95b3470f6ab4277a8@www.novabbs.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Date: Thu, 26 Sep 2024 17:09:32 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="554dd974973108addb9bc50f79df8e0b";
	logging-data="253504"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX18ii8hhcZ4jRmo0TWan9rjhzXuRkr1DA3Q="
User-Agent: Unison/2.2
Cancel-Lock: sha1:xAoBhk0o5Cnw3KeMnFCWvHXsTWU=
Bytes: 2691

On 2024-09-26 12:44:21 +0000, gharnagel said:

> On Wed, 25 Sep 2024 15:57:46 +0000, Athel Cornish-Bowden wrote:
>> 
>> On 2024-09-25 15:34:35 +0000, gharnagel said:
>>> 
>>> Actually, it might be correct.
>> 
>> Yes, but it's still not something drawn by Minkovski.
> 
> 
> It wasn't drawn by Einstein or Poincare, either.  They're all
> dead.  It is, however, a Minkowski diagram,

No one sai it wasn't, but "Dr" Hachel's question was "Did you see where 
Minkowski places his simultaneity plans?" clearly indicating that he 
thinks Minkovski drew it.

> and the simultaneity
> lines in the prime frame are defined by t = vx/c^2 + Constant
> going and negative slope returning, exactly as Minkowski would
> have drawn them.
> 
>>> 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