Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Athel Cornish-Bowden 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: References: <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