| Past hypothesis Composant1 #104152 We inhabit a universe - or part thereof - characterized by a low-entropy past that has enabled the evolution of intelligent observers to occur. This together with Boltzmann's probabilistic argument (see sibling node) implies entropy will increase over time toward thermal equilibrium. |
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En citant: Huw Price - Head of the Center for Time, University of Sydney
Cité par: Peter Baldwin 3:03 AM 15 April 2011 GMT
Citerank: (6) 100641The 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.7F1CEB7, 103807The experience of timeThis branch of the map considers the phenomenology of time - the various ways in which time presents itself directly to our consciousness. Why do we think time has the features indicated by the passage view? The answers will hopefully enable us to connect the phenomenological to the physical.8FFB597, 103810Why 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.8FFB597, 103810Why 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.8FFB597, 104155Boltzmann-Schuetz hypothesisBoltzmann and Schuetz claimed that in a universe that is near thermal equilibrium, and given sufficient time, there will be regions where there is a temporary deviation into a low entropy state, from which it will trend back to equilibrium. Anthropic selection accounts for us being in such a region.959C6EF, 105365Anti-matter objectionIf the time-asymmetry of thermodynamics were associated with the symmetry violation of the neutral K meson (neutral Kaon) then anti-matter would show the reverse of the normal thermodynamic asymmetry AND no such anti-matter reversal is apparent.13EF597B
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| Extrait - "If the one-asymmetry view is correct, the puzzle of the thermodynamic arrow is really the puzzle of the low entropy boundary condition. Why is entropy so low in the past ?" (page 125) |