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The Arrow of Time
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Information theoretic explanation
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1
#112152
A number of physicists and philosophers have claimed that remembering - by humans or computers - can only occur in a rising-entropy environment. Such claims generally draw on the requirements for persisting and utilizing information. Two approaches to formally demonstrating this link are addressed.
In addition a number of physicists and philosophers have simply asserted that the psychological (memory) arrow must align with the thermodynamic arrow - see citations below from Sean Carroll and J.J.C. Smart.
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[1]
Why can't we remember the future? (article excerpt)
Author:
Sean M. Carroll - Theoretical physicist, California Institute of Technology
Cited by:
Peter Baldwin
9:44 AM 24 June 2011 GMT
Citerank:
(1)
107148
Entropy gradient explains agency
The existence of a low entropy past explains why the future is mutable and the past is not.
9
59C6EF
URL:
http://eands.caltech.edu/articles/LXXIII1/2010_Winter_Carroll.pdf
Excerpt / Summary
"So the arrow of time isn’t just about simple mechanical processes; it’s a necessary feature of the existence of life itself. But it’s also responsible for a deep feature of what it means to be a conscious person: the fact that we remember the past, but not the future. According to the fundamental laws of physics, the past and future are treated on an equal footing; but when it comes to how we perceive the world, they couldn’t be more different. We carry in our heads representations of the past, in the form of memories. Concerning the future, we can make predictions, but those predictions have nowhere near the reliability of our memories of the past.
Ultimately, the reason we can form a reliable memory of the past is that the entropy was lower then.
"
Link
[2]
Time (article in Encyclopedia of Philosophy, MacMillan 1967)
Author:
Smart, JJC
Cited by:
Peter Baldwin
4:10 AM 25 August 2011 GMT
Citerank:
(1)
113879
Causality, not entropy
Some philosophers argue that there is too much emphasis on entropy in efforts to find a physical correlate for the psychological arrow of time. Earman (see citation) argues the leaving of traces of past events may have nothing to do with entropy but rather to causal asymmetry.
13
EF597B
URL:
http://www.jstor.org/pss/187375
Excerpt / Summary
The formation of a trace is the formation of a subsystem of temporarily lower entropy than that of its surroundings... A footprint in the sand is a temporarily highly ordered state of the sand; this orderliness is brought about at the expense of an increased disorderliness (metabolic depletion) of the pedestrian who made it... On investigation it will be seen that all sorts of traces, whether footprints in the sand, photographs, fossil bones, or the like can be understood as traces in this sense. Indeed, so are written records.
The close connection between information and entropy is brought out in modern information theory, the mathematics of which is much the same as that of statistical mechanics.
Cited in Earman article on pp 41-2
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