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Energy dynamics is primary Opinion1 #112453 [stub]

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The Arrow of Time »The Arrow of Time The Arrow of Time ☜A map exploring some issues concerning the nature of time that lie at the boundary of physics and philosophy. The map follows up a talk to the Blackheath Philosophy Forum on 2 April 2011 by Huw Price, Professor of Philosophy and director of the Center for Time at Sydney University.☜F1CEB7

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The physics of time »The physics of timeThe physics of time☜Is our subjective sense that time has a direction from past to future reflected in impersonal physical processes and laws? Is it better - from the impersonal viewpoint - to look asymmetries in time rather than a direction (to the future) of time?☜FFB597

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The thermodynamic arrow »The thermodynamic arrowThe thermodynamic arrow☜The Second Law of Thermodynamics implies an arrow of time in the sense that the entropy (or disorder) of an isolated system such as the whole universe never decreases - it either increases or remains constant.☜59C6EF

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Why do we see an entropy gradient? »Why do we see an entropy gradient?Why do we see an entropy gradient?☜We find ourselves in an observable universe in which entropy increases consistently in one direction, thereby showing time asymmetry - an arrow of time. Yet the vast majority of underlying dynamical processes are time-symmetric. How to account for this? Two broad approaches are considered here.☜FFB597

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Asymmetric boundary condition »Asymmetric boundary conditionAsymmetric boundary condition☜We see entropy increasing because: 1. An isolated system in a less than maximal entropy state will spontaneously evolve toward higher entropy. 2. We inhabit a universe (or part thereof) at less than maximal entropy. Both must be true for the explanation to work.☜59C6EF

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Boltzmann's statistical imperative »Boltzmann's statistical imperativeBoltzmann's statistical imperative☜Boltzmann provided a statistical argument to show that an isolated system not at maximal entropy will is overwhelmingly likely to evolve toward higher entropy - hence the second law and the thermodynamic arrow.☜9FDEF6

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Maxwell's demon objection »Maxwell's demon objectionMaxwell's demon objection☜Maxwells demon is a thought experiment that shows how the Second Law can be violated. Take a container divided into two parts containing gas, and imagine that the demon controls a gate between the two only allowing hot molecules to go into one compartment, leading to increased entropy.☜EF597B

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Need to take account of information »Need to take account of informationNeed to take account of information☜The Second Law is not violated provided account is taken of the entropy of the whole system - including the energy expended by the demon in gathering the required information.☜EF597B

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Information and the Second Law »Information and the Second LawInformation and the Second Law☜In response to Maxwells demon, some have argued that information dynamics rather than energy dynamics provide the fundamental grounding of the Second Law. This has important implications for how memories are stored - and the link between the entropy gradient, memory and time perception.☜FFB597

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Energy dynamics is primaryEnergy dynamics is primary☜[stub]☜59C6EF

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Entrée par: Peter Baldwin
NodeID: #112453
Node type: Position
Date d'entrée (GMT): 6/27/2011 3:54:00 AM
Date de la dernière modification (Heure GMT): 6/27/2011 3:55:00 AM
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