Re: What causes time dilation?

From: Bill Hobba (bhobba_at_rubbish.net.au)
Date: 09/09/04 

Date: Thu, 09 Sep 2004 09:01:29 GMT

"Alex Green" <dralexgreen@yahoo.co.uk> wrote in message
news:42c8441.0409070212.2d350af1@posting.google.com...
> suzysewnshow@yahoo.com.au (suzysewnshow) wrote in message
news:<e0a23188.0408290327.2452d9f8@posting.google.com>...
> > "Bill Hobba" <bhobba@rubbish.net.au> wrote in message
news:<CO7Yc.11325$D7.8992@news-server.bigpond.net.au>...
> > > "suzysewnshow" <suzysewnshow@yahoo.com.au> wrote in message
> > > news:e0a23188.0408280757.57d63067@posting.google.com...
> > > > "Bill Hobba" <bhobba@rubbish.net.au> wrote in message
> > news:<giRXc.10363$D7.1015@news-server.bigpond.net.au>...
> > > > > "Mitchell" <macromitch@internetCDS.com> wrote in message
> > > > > news:9c3da975.0408271442.caf7aaf@posting.google.com...
> > > > > > Uncle Al and the rest have no mechanism for the physical
property
> > > > > > of the slowing of time.
> > > > >
> > > > > What causes the x coordinate of a rotating rod to change?
> > > > >
> > > > > Bill
> > > > >
> > > > > > I'll give you a mechanism.
> > > > > > If time moves then by speeding up you can catch up to it.
> > > > > > If it moves at the speed of light then it slows down as
> > > > > > you catch up with it.
> > > > > >
> > > > > > We talk about c. But it is more than just the speed of light.
> > > > > > It is the speed of time before there is any dilation.
> > > > > >
> > > > > > Mitch Raemsch
> > > > > > -- Light Falls --
> > > >
> > > > Time (in SR) dilates because the ether wind blows the bouncing light
> > > > off course as opposed mirrors move through the ether.
> > >
> > > You mean an aether that has never been detected and whose existence is
not
> > > assumed in SR, a theory that is fully in accord with experiment? You
logic
> > > is obviously wrong.
> > >
> > > > Like it or not,
> > > > that is how most, but not all of the clocks in SR behave.
> > >
> > > Like it or not SR does not require an aether.
> > >
> > > > Since time
> > > > is a mathematical abstraction, clocks can't measure it... they can
> > > > only simulate its passage.
> > > > Kind regards,
> > > > Sue...
> > >
> > > Time is what clocks measure and is as real and a concrete as anything
in
> > > physics.
> > Concrete? Then it should not vary should it?
> > >
> > > Bill
> > The First postulate says that light must take the shortest time path
> > between opposed mirrors. If for any frame of reference, then for all
> > frames of reference.
>
> Modern relativity theory does not have this foundation. It is based
> on invariance and symmetry. The geodesics are derived from the concept
> of a (3+1)D universe.
>
> See:
> http://www.users.globalnet.co.uk/~lka/conz2b.htm
>
> For a simple intro. We have two competing theories here, in the first
> the universe is full of some substance 'the aether' and in the second
> the universe is a four dimensional manifold. The second theory has led
> to predictions from Quantum Theory (via de Broglie Waves and the Dirac
> Equation) to Black Holes. The first theory was a complicated mass of
> unrelated empirical equations by 1900 and desperately needed to be
> replaced.
>
> Many people are committed 'presentists' and just will not accept the
> possibility that time has a geometric character. I think it was the
> gifted art historian Gombrich who pointed out that if the present were
> just a durationless instant, a boundary between what has been and what
> is to come, we could not even hear the merest phoneme of a word or see
> a movement. Everything is frozen at any instant in Galilean
> Relativity. Motion itself would be impossible.
>
> However, that said, I think a gifted mathematician could tack bits on
> to Newtonian physics to account for all the disoveries of the
> twentieth century. All that is needed is an ever increasing library of
> unrelated assumptions. Theories don't need to die, you can keep them
> going well past their natural lifespan with enough mathematical TLC.

Interesting view. I think it was Hilbert who remarked something along the
lines that the lowest of mathematicians knew more about non Euclidean
geometry than Einstein; yet it took a physicist to discover GR. Food for
thought - see http://modeling.la.asu.edu/R&E/SecretsGenius.pdf.

Thanks
Bill

>
> Best Wishes
>
> Alex Green

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