On 12/26/2013 5:02 AM, Edgar L. Owen wrote:
Brent,
Yes, the reuniting is an event, an event like every event that occurs in the
present moment.
Think about it this way. Assume every observer in the entire universe travels
relativistically to meet up at a common location. There will be billions of different
clock time readings on their clocks but they will all be together in a single common
present moment.
Therefore it is clear and inescapable that the present moment
No, that's *a* present moment *at a specific place*. It's an event, not a
global time.
is universal and common to every observer in the universe.
All the effects of SR and GR affect clock times, but every one of them occurs in a
single common present moment they all share.
They don't share it unless they are at the same place in space at the moment, i.e. at an
event.
Brent
In fact this is completely clear because otherwise they could not even compare clock
time results to know they were different.
Edgar
On Tuesday, December 24, 2013 8:26:00 PM UTC-5, Edgar L. Owen wrote:
Liz states that "Special relativity shows that there is no such thing as a
"common
present moment". but this is incorrect.
Actually special relativity shows exactly the opposite. In my book I
explain how
this works. It is well known, though little understood, that everything
without
exception continually travels through spacetime at the speed of light
according to
its own comoving clock. I call this the STc Principle. This is a well known
consequence of special relativity but actually as I point out in my book
this is an
even more fundamental Principle than Special Relativity and Special
Relativity is
properly a consequence of it and can be derived from it.
What the STc Principle says is that the total velocity through both space
and
through time of everything without exception is = to the speed of light.
This is the
reason that time slows on a clock moving with some relative spatial
velocity, as
Special Relativity tells us.
It also demonstrates that the speed of light is properly understood as the
speed of
TIME. That's what c really is. Light just happens to move entirely in space
according to its own comoving clock, therefore its entire spacetime
velocity is in
space only.
Anyway it is precisely this STc Principle that puts both the arrow of time
and a
privileged present moment on a firm physical basis. Why? Because it
requires that
everything must be in one particular place in spacetime (the present
moment) and
moving at the speed of light (the arrow of time).
So exactly contrary to your statement, it is precisely special relativity,
properly
understood, that puts both the arrow of time and a common present moment on
a firm
physical basis.
This insight simultaneously solves two of the big problems of the
philosophy of
science, the source of the arrow of time, and the reason for a common
present
moment, though no one seems to have recognized this prior to my exposition
in 1997
in my paper 'Spacetime and Consciousness'.
Edgar
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