On Wed, Jan 1, 2014 at 8:41 AM, Russell Standish <li...@hpcoders.com.au>wrote:

> On Mon, Dec 30, 2013 at 01:20:35AM -0800, Edgar L. Owen wrote:
> > Jason,
> >
> > That's a totally off the wall answer. When the two shake hands it's not
> > just photons that are interacting, it's the electrons, protons and
> neutrons
> > of the matter of their hands which don't travel at the speed of light.
> >
> > Goodness gracious!
> >
> > Edgar
> >
>
> Jason is correct - electron-electron and electron-proton interactions
> are mediated by photons. Only nucleon-nucleon interactions are
> mediated by different stuff (gluons in that case), but for all
> practical purposes, the strong force is irrelevant to the phenomenon
> of handshaking.
>

And if it were, say in some particle accelerator, the gluons also travel at
the speed of light and their present is spread across all proper times.


>
> Which gets us to the more important point. You idealise a handshake as
> instantaneous as a demonstration of your "present moment", but in fact
> those interactions Jason was alluding to are smeared out over a
> temporal duration of the order of a few picoseconds (a duration well
> measurable by current day technology - my laptop's CPU clock cycles on
> a sub-picosecond timescale, for example).
>

You must have a VERY fast laptop! :-)

Jason


> This doesn't matter much for human affairs, but becomes quite
> significant when extrapolating over cosmological scales.
>
> Cheers
> --
>
>
> ----------------------------------------------------------------------------
> Prof Russell Standish                  Phone 0425 253119 (mobile)
> Principal, High Performance Coders
> Visiting Professor of Mathematics      hpco...@hpcoders.com.au
> University of New South Wales          http://www.hpcoders.com.au
>
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