Re: anothe question: Do multiple speeds = multiple clocks?
- From: "paparios@xxxxxxxxx" <paparios@xxxxxxxxx>
- Date: Wed, 2 Jan 2008 16:46:23 -0800 (PST)
On 2 ene, 20:50, "gharn...@xxxxxxxxxxx" <gharn...@xxxxxxxxxxx> wrote:
As of this writing, about 7:30 EST on January 2, several other
contributions to this thread have arrived. It's not clear to me which,
if any, of these posters accurately reflect the general interpretation
of E's theory of SR ("T-SR"), so I'll inquire further.
Another subscriber has reiterated the familiar remarks about the
observers' communications between themselves, the difficulty of
knowing what the other is doing, and so forth, but, again, these
matters are incidental to T-SR. It is a theory of being, not of
knowing.
These matters are not incidental but crucial in SR. As you describe
your thought experiment, there are two observers isolated in an empty
universe, so they only see each other. So when you ask what the clock
lecture is at each observer, well the only valid answer is "what the
clock shows at each observer". The only way A can know what B's clock
is reading is by receiving information about that clock behavior. This
information is crucial in the measuring of events, specially when
those events are happening several light years away.
In the situation I described, it appears to me, then, that the
acceleration of the observers *is* symmetric.
Acceleration is produced by an engine (a rocket, for instance) and if
you consider that if observer B accelerate (feeling all the effects of
the acceleration force due to his engine) then observer A will notice
a similar acceleration, without using a rocket, then you are quite
wrong since the situation is clearly not symmetric.
Note, moreover, that the situation cited could be altered in such a
way as to eliminate the factors that cause these posters to assign to
B the acceleration and the experience of increased G-force. Here it
is:
Let us suppose that neither observer is wearing a backpack-rocket. Let
us suppose that, though at first stationary with respect to another,
they suddenly speed away from one another in opposite directions
through some force acting equally upon them both. How do their clocks
behave then?
G Harnett
If both A and B accelerate for some time, using an identical engine,
in order to get close to c, and then they stop accelerating and follow
in an inertial path, then the situation is exactly the same that the
one without acceleration, that is, both observers will consider the
other guy's clock to run slow. To do that they need to exchange clock
information between them.
Miguel Rios
.
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