## time symmetry | |

Funney User ID: 11648979 Czechia 01/28/2013 05:29 AM Report Abusive Post Report Copyright Violation | 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 $S(t) < S(t')$. [link to math.ucr.edu] = time is choice we made ? moral reasoning takes about 250 miliseconds we make errors in between perception->relation->behaviour |

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