Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > sci.physics.relativity > #359384

Re: Inescapable (symmetric) twins paradox

Show all headers | View raw

On Saturday, August 1, 2015 at 11:48:00 AM UTC-7, wobbly wrote:
> JanPB wrote:
> 
> > This is very basic, it simply follows from the general formula for arc
> > length which is sqrt(g_ij qdot^i qdot^j) dt when the coordinates ARE
> > standard inertial, i.e. g = -c^2 dt^2 + dx^2 + dy^2 + dz^2
> 
> Is this the same as 
> 
>     g = [-(cdt)², (dx)², (dy)², (dz)²]

I don't know what you wrote on the right-hand side. It's not correct mathematics,
so if it's some private notation that you use, explain it first.

> Why don't you say so. What is g anyway, arc length? On which circle?

Not on circle (what an idea!). g is the Minkowski metric coefficients given
with respect to some noninertial coordinates (like those of the travelling twin).

--
Jan

Back to sci.physics.relativity | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: Inescapable (symmetric) twins paradox "Julio Di Egidio" <julio@diegidio.name> - 2015-07-23 14:49 +0100
  Re: Inescapable (symmetric) twins paradox "Dono," <sa_ge@comcast.net> - 2015-07-23 06:54 -0700
  Re: Inescapable (symmetric) twins paradox rotchm <rotchm@gmail.com> - 2015-07-23 07:24 -0700
    Stephane Baune puffs himself up "Dono," <sa_ge@comcast.net> - 2015-07-23 07:31 -0700
      Re: Stephane Baune puffs himself up "Dono," <sa_ge@comcast.net> - 2015-07-23 10:35 -0700
      Re: Stephane Baune puffs himself up and proves himself  a severely delusional POS "Dono," <sa_ge@comcast.net> - 2015-07-23 11:12 -0700
  Re: Inescapable (symmetric) twins paradox Sylvia Else <sylvia@not.at.this.address> - 2015-07-24 11:44 +1000
  Re: Inescapable (symmetric) twins paradox Tom Roberts <tjroberts137@sbcglobal.net> - 2015-07-23 22:00 -0500
    Re: Inescapable (symmetric) twins paradox paparios <paparios@gmail.com> - 2015-07-24 04:50 -0700
    Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-07-25 08:34 -0700
      Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-25 09:06 -0700
    Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-25 09:04 -0700
      Re: Inescapable (symmetric) twins paradox Tom Roberts <tjroberts137@sbcglobal.net> - 2015-07-27 16:40 -0500
      Re: Inescapable (symmetric) twins paradox rotchm <rotchm@gmail.com> - 2015-07-27 14:42 -0700
        Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-27 14:58 -0700
          Re: Inescapable (symmetric) twins paradox rotchm <rotchm@gmail.com> - 2015-07-27 16:25 -0700
          Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-28 14:08 -0700
      Re: Inescapable (symmetric) twins paradox wobbly <wobbly@dont-email.me> - 2015-07-29 19:26 +0000
        Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-29 12:47 -0700
          Re: Inescapable (symmetric) twins paradox wobbly <wobbly@dont-email.me> - 2015-07-29 20:08 +0000
            Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-29 13:42 -0700
        Re: Inescapable (symmetric) twins paradox "Dono," <sa_ge@comcast.net> - 2015-07-29 12:59 -0700
          Re: Inescapable (symmetric) twins paradox wobbly <wobbly@dont-email.me> - 2015-07-29 20:10 +0000
      Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-01 22:21 -0700
        Re: Inescapable (symmetric) twins paradox wobbly <wobbly@dont-email.me> - 2015-08-02 10:53 +0000
          Re: Inescapable (symmetric) twins paradox wobbly <wobbly@dont-email.me> - 2015-08-02 11:00 +0000
          Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-02 21:07 -0700
            Re: Inescapable (symmetric) twins paradox Bohuš Matuška <bohu@paranetnet.net> - 2015-08-03 15:11 +0000
    Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-07-25 22:57 -0700
    Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-07-25 22:57 -0700
      Re: Inescapable (symmetric) twins paradox Odd Bodkin <bodkinodd@gmail.com> - 2015-07-27 09:49 -0500

csiph-web