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posted by martyb on Tuesday May 06 2014, @02:32PM   Printer-friendly
from the second-chances-come-first dept.

Thought experiment proposed to reconcile psychological versus thermodynamic arrows of time:

A pair of physicists has proposed a thought experiment to help reconcile the seeming disparity between the psychological and thermodynamic arrows of time. In their paper published in the journal Physical Review E, Leonard Mlodinow and Todd Brun claim their thought experiment demonstrates that the two seemingly contradictory views of time, must always align.

When ordinary people think about time, they see the past as something that has come before and the future as a great unknown yet to come. We can remember the past, because it has happened already, but not the future, because it hasn't. Physicists, on the other hand see time as able to move either forward or backwards (towards greater entropy), which implies that we should be able to remember events in the future. So, why can't we?

It's because of the way our memories work the two say, and they've created a thought experiment to demonstrate what they mean. Imagine, they write, two chambers connected by an atomic sized tube with a turnstile in it. If there is gas in one of the chambers, individual atoms of it will move through the tube to the other chamber (towards higher entropy) tripping the turnstile as they go, in effect, counting the atoms as they pass by, until both sides have equal numbers of atoms-creating a state of equilibrium.

http://phys.org/news/2014-05-thought-psychological -thermodynamic-arrows.html

Arrow of Time FAQ

http://physics.aps.org/articles/v7/47

http://journals.aps.org/pre/abstract/10.1103/PhysR evE.89.052102

 
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  • (Score: 2) by BasilBrush on Tuesday May 06 2014, @04:13PM

    by BasilBrush (3994) on Tuesday May 06 2014, @04:13PM (#40206)

    The future depends on what we (observers: humans and other conscious entities) decide our future universe will become.

    Conscious entities are no different from unconscious entities. They're still made up of atoms and other fundamental particles acting according to the laws of physics. Whilst you may think you have free will to make an arbitrary decision, you don't know it. It may be that all your future decisions are predetermined.

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