jbml thln 30 the causal principle


IS
THAT EVENTS
AT ONE HISTORICAL
TIME CANNOT AFFECT EVENTS
AT AN EARLIER HISTORICAL TIME.

NEVERTHELESS, TEMPORAL SEPARATION,
KNOWN AS COORDINATE TIME OR EINSTEIN TIME
AND MEASURED ON CONVENTIONAL CLOCKS, CAN CHANGE DIRECTION
AS HISTORICAL ADVANCES, SO THAT EVENTS OBSERVED AS TEMPORALLY SEQUENTIAL
ACCORDING TO A LABORATORY CLOCK
MAY HAVE EVENTUALLY OCCURRED
IN A VERY DIFFERENT
HISTORICAL ORDER?

Therefore,
physical models
provide different kinds
of "predictions" about the future -
a prediction of how the physical configuration
will evolve as the historical time evolves, and another prediction
of how the physical configuration at a particular historical time will appear in a laboratory
at some past or future temporal situation. So, the correct statement of how some deterministic physical system
will look in 25 years may change significantly
over historical time.

Similarly,
it may be possible
to "travel backward in time"
(appear at values of the clock/calendar that we currently regard as the past),
but it is not clear what we will observe
and what kind of interactions
we will be able
to experience.

We will certainly not be
able to change events
that occurred at
earlier historical
times.
knipoog

05 mrt 2013 - bewerkt op 06 mrt 2013 - meld ongepast verhaal
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