Re: Is 'time' time or is it not.

On 2005-08-29, stefanbanev@xxxxxxxxx <stefanbanev@xxxxxxxxx> wrote:
>
> Igor Khavkine wrote:
>> On 2005-08-28, RHNL <rhnl@xxxxxxxxxxxx> wrote:
>
>> We live in a 4-dimensional space-time.
>
> It is quite strong statement ;o)

It's an assumption, but it's served us exceptionally well for the past
300 years.

>> In theories based on special relativity, the clock readings do depend on
>> the motion of the observers. So if two clocks are brought together after
>> an earlier synchronization, they will not necessarily give the same
>> readings. However, if we know details of the motion of the two observers
>> in between, special relativity gives us a recipe for translating between
>> the readings of different clocks.
>
> SR is applied only for inertial systems, so there is no way to consider
> "brought together after an earlier synchronization" clocks. In GR
> it is possible.

That's a common misconception. SR applies whenever gravity (read
space-time curvature) can be neglected. See for example the explanation
of the Twin Paradox in the Physics FAQ:

http://math.ucr.edu/home/baez/physics/Relativity/SR/TwinParadox/twin_paradox.html

>> For both non-relativistic and special relativistic theores, there exist
>> both classical and quantum formulations. In this sense, QM does not
>> treat time any different than we would expect.
>
> Causality is the essence of time perception, in this sense, time in QM
> and in GR looks different. Bell experiment is one of the profound
> examples of that.

Causality is built into both GR and quantum mechanics. I presume you
refer to EPR-type entanglement experiments. They do not violate
causality, so I don't see what you mean.

Igor

.

Relevant Pages

  • Re: Is time time or is it not.
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  • Re: Is time time or is it not.
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    (sci.physics.research)
  • Re: Why does the physicallity of Time matter?
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