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Old January 7th 13, 09:51 PM posted to sci.physics.relativity,sci.physics,sci.astro,sci.math
Koobee Wublee
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Posts: 815
Default Simplified Twin Paradox Resolution.

On Jan 7, 12:31 pm, Absolutely Vertical
wrote:
On 1/7/2013 12:43 PM, Koobee Wublee wrote:


That was what PD said years ago. Stupid PD, an ex-professor of
physics at a university in Texas. shrug


i would imagine a lot of people would say it, since it's not so.
if someone tells you that the earth is not flat, i expect you to remark
that someone else on usenet said so too.


Flat earth was exactly what ignorant PD had argued before. For your
information, PD, since the age of maritime sailing about 3 to 4
thousands of years ago, people always knew the earth was spherical,
and that was even the case during the darkest of the Dark Age.
Columbus did not try to convince his financier that the earth was
spherical. He was trying to convince his backers that the earth was
not as big as what they believe in. In fact, Columbus was wrong. He
had underestimated the size of the earth by about 1/3. shrug

After both have done their acceleration, they continue to move away
from each other. What is their relative speed? Does the Lorentz
transform not say time dilation? At this moment, who is actually
moving, and who is not? If time dilation is building up, how does it
evaporate? shrug


in the turnaround of one of them.


How? Say 100 years of time dilation all gone in one turn around?

Actually not according to the Lorentz transform. You cannot make up
your own laws of physics. You are no god. shrug


the lorentz transform as you're using it doesn't deal with the
turnaround. you need to use the version that deals with the acceleration
of the turnaround.


Believing yourself to be a god does not make you a god, PD. shrug

Just how many versions of the Lorentz transform are there? shrug

In this case, both accelerate with a coasting period to allow for
mutual time dilation building up. Shouldn’t the magic effect of
acceleration cancel out?


in the case where both twins accelerate, then there is no asymmetry.
while there is a change that happens during the acceleration, it's the
same for both, so when they meet again, their clocks show the same time.


Where is the math that supports your faulty claim? shrug

yes, the turnaround undoes the time dilation of the coasting period. for
both observers in the symmetric case, the other's clock leaps forward to
be ahead of the other's clock. if this comes as a shock it's because
you've never looked at the generalization of the lorentz transform in an
accelerated frame.


And what exactly is this generalization of the Lorentz transform in
the accelerated frame? shrug

If not, why not? Just what part of this
simple scenario do you not understand, PD? shrug