Re: Re: Le piège parfait (the perfect trap)

"Paul.B.Andersen" <relativity@paulba.no> wrote or quoted:

Both SR and GR "covers accelerated frames of reference".

  In special relativity, one can still talk about the proper time
  length of a section of an accelerated dude's world line from the
  perspective of a non-accelerated guy. But one can't describe the
  x-t coordinate system that the accelerated dude is using, because
  for him to be at rest, he's got to assume there's a gravitational
  field to explain why he feels like he's accelerating. A Lorentz
  transformation (a "boost") isn't enough to get one to that x-t
  coordinate system of the accelerated guy starting from the x-t
  coordinate system of some non-accelerated dude.