[FoRK] Relativistic "twin paradox" resolved?

Albert S. <albert.scherbinsky at rogers.com> on Tue Feb 20 15:25:16 PST 2007

You're not suggesting that Mach's principle accounts
for the time dilation in the twin paradox are you?

>From wikipedia:
Einstein—before completing his development of the
general theory of relativity—found an effect which he
interpreted as being evidence of Mach's principle. We
assume a fixed background for conceptual simplicity,
construct a large spherical shell of mass, and set it
spinning in that background. The reference frame in
the interior of this shell will precess with respect
to the fixed background. This effect is known as the
Lense-Thirring effect......

Lense and Thirring predicted that the rotation of an
object would alter space and time, dragging a nearby
object out of position compared to the predictions of
Newtonian physics. This is the frame-dragging effect.
The predicted effect is incredibly small — about one
part in a few trillion — which means that you have to
look at something very massive, or build an instrument
that is incredibly sensitive.


--- Russell Turpin <deafbox at hotmail.com> wrote:

> Look up Mach's principle.
> And ask yourself if the universe is spinning. ;-)
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