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# time symmetry

Anonymous Coward
User ID: 33044166
Belarus
01/28/2013 05:00 AM
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time symmetry
There is hidden symmetry within the timeline which is not linear but follows some group order.

I think it must be possible to calculate it back.

19.5 and stuff like that must be related.

The symmetry is reflection through group transformation.

The transformation itself must be detectable if we use large enough subset.

[1,2,3,4,5,6] - [6,5,4,3,2,1] = [symmetry group transformer]
Funney

User ID: 11648979
Czechia
01/28/2013 05:29 AM

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Re: time symmetry
The key point here is that in the standard model,
the weak force violates C, P, and T symmetry,
while electromagnetism and the strong force admit all these symmetries.

As with the time arrow of radiation, in the last analysis it appears to be nothing but a raw experimental fact that the entropy of our universe is increasing. In a sense this is not surprising, because pondering chemistry and biology a bit it becomes apparent that life as we know it requires the entropy to be changing monotonically, rather than staying about the same. One might ask why ${dS \over dt} > 0$ rather than ${dS\over dt} < 0$, but this is essentially a matter of convention. Processes like remembering and planning, which define the psychological notions of future and past, are only able to occur in the direction of increasing entropy. That is, a memory at time $t$ can only be of an event at time $t'$ for which $S(t') < S(t)$, while a plan at time $t$ can only be for an action at time $t'$ for which $S(t') > S(t)$. Since we have settled on using calendars for which the number of the years increase in the direction of plans, rather than memories, we have chosen a time coordinate $t$ for which $t < t'$ implies $S(t) < S(t')$.