Re: SR-ians lost without absolute background


<surrealistic-dream@xxxxxxxxxxx> wrote in message
news:1144080666.555386.180790@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Hayek wrote:
Special Relativity protagonists, always claim they do
not need an absolute background.

Let us look at their twin "paradox"(1) solution :

To know which twin ages less, SR-ians sputter, we look
at the twin who does the accelerating.

But when does a twin accelerate ? When he increases
his speed wrt to the average mass distribution of the
universe.

False. False. False. Einstein claimed that in SR acceleration is
absolute, just as it is in Newtonian mechanics. SR defers the problem
of relativity of acceleration, which is taken up in GR!

SRists use the model called spacetime as an "absolute" replacement for
the rest space of the Lorentzian ether. It's only claim to "absolute,"
however, is that all inertial frames share the same light cones at all
events. However, this use of the term "absolute" to spacetime is purely
formal and it breaks with the tradition in physics that "absolute"
should apply to physical spaces or time. But spacetime is not a thing.
In SR it is an abstract model used to aid in the correlations of
distant events in a Lorentz-invariant world.

That's an often heard misconception: only if spacetime is supposedly
something can it cause preferred lines of motion as well as absolute effects
such as observed with acceleration and time dilation.

Both SR and GR deal with accelerated frames of reference. The
distinction between them is that in SR the hypotheses about the
behavior of clocks and rods in accelerated frames of reference are made
ad hoc as the simplest possible extensions to the accepted
Lorentz-covariant laws, which are the embodiment of the PoR, which
deals with inertial frames; but in GR, the laws of the behavior of
clocks and rods must be made at the time that the Principle of General
Relativy is given, because there is made no fundamental difference in
GR between accelerated and inertial frames of reference for the purpose
of formulating the laws of physics.

Not entirely correct, and certainly not for the twin paradox with changing
"fields". You never wondered why Einstein's GRT solution of the twin paradox
hasn't been translated into English (except in part by Dingle)?

Harald


.

Relevant Pages

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    ... his ship that we tell him his absolute linear velocity. ... Although it is called angular velocity it is really acceleration ... No experiments can distinguish between inertial frames by ... equations of physics. ...
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