Re: Twin paradox revisited ll


<cosmosco@xxxxxxxxxxxxxxx> wrote in message news:1184370417.174644.188050@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
So I take it that nobody openly supports the idea that the earth bound
twin physically ages at a faster rate than the traveler and that this
only occurs during acceleration following turn around?

Sorry, I did not see your response to my reply to your previous post
so I will respond to that now.

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[cosmosco]
My question is - does the claim that the traveller does not age at the
slower rate but that his twin ages at a faster rate and only during
the ships period of acceleration following turn around still have any
support?

[Hogbin]
Your question is still not clear to me. The two twins age
differently with respect to one another. To say one ages
'at a slower rate' has no meaning unless you say with
respect to what.

If each twin were to measure the aging of the other, making
allowance for the transit time of light or radio or whatever
measurement medium they used, they would each measure
the other to be aging slower during the cruise phase of the
flight.

During the turn-around the situation is more complicated.
The earthbound twin remains in an (approximately) inertial
frame throughout. As the traveller turns around, the
inertial twin would measure the travelling twin's time to
return to normal as the traveller came to a stop and then
run more slowly again as the traveller accelerated to begin
their return journey.

As the traveller turns round, they are not in an inertial frame.
Measurements made from non-inertial frames are weird, but
one view they might take is that time for the inertial twin
rushed forward during the turn-around. Neither the
earthbound twin nor anyone else on Earth would notice
anything odd during this time.


Various aspects of relativity have, of course, been
published in peer-reviewed journals and the theory is
completely accepted. The only dissent is in places
like this newsgroup where any crackpot is free to post.


[cosmosco]
If there was no dissent there would be no progress.Several authors
have accepted that special theory may eventually be replaced.

[Hogbin]
There is research into relativity on two basic fronts. Firstly
into the mathematics of general relativity, which is
complicated. Secondly, most current research is into
reconciling relativity with quantum mechanics. If this
succeeds then there may well be a theory to replace
relativity but relativity will probably still stand as an
excellent approximation in non-quantum cases, just as
Newtonian physics stands as an approximation to
relativity.


[cosmosco]
Thanks Martin, although, as you point out, the respective ageing of
the twins during the journey has several interpretations perhaps you
could let me know of one that has been completely accepted by the
scientific community?

Preferably one that is presented in everyday language and is not
reliant on mathematical equations.


[Hogbin]
To the best of my knowledge the descriptions I have given above
represent the accepted view of how each twin will measure things.
Does this answer your question?


--
Martin Hogbin





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