Go Back   Physics Help Forum > Physics Forums > Physics

Physics Physics Forum - General Physics Discussion and Physics News

Reply
 
LinkBack Thread Tools Display Modes
Old Sep 6th 2009, 08:19 AM   #1
Senior Member
 
arbolis's Avatar
 
Join Date: Apr 2008
Posts: 815
Maccone's viewpoint on the arrow of time

Unfortunately we must pay to read the paper Cookies Required.
Here's the abstract :
The arrow-of-time dilemma states that the laws of physics are invariant for time inversion, whereas the familiar phenomena we see everyday are not (i.e., entropy increases). I show that, within a quantum mechanical framework, all phenomena which leave a trail of information behind (and hence can be studied by physics) are those where entropy necessarily increases or remains constant. All phenomena where the entropy decreases must not leave any information of their having happened. This situation is completely indistinguishable from their not having happened at all. In the light of this observation, the second law of thermodynamics is reduced to a mere tautology: physics cannot study those processes where entropy has decreased, even if they were commonplace.
.
Here's a critic of the paper : The Arrow of Time: Still a Puzzle | Cosmic Variance | Discover Magazine.
__________________
Isaac
If the problem is too hard just let the Universe solve it.
arbolis is offline   Reply With Quote
Old Sep 6th 2009, 10:18 AM   #2
Physics Team
 
Join Date: Feb 2009
Posts: 1,425
Thanks thats really interesting. Could you manage to read the paper?
physicsquest is offline   Reply With Quote
Old Sep 6th 2009, 10:52 AM   #3
Senior Member
 
arbolis's Avatar
 
Join Date: Apr 2008
Posts: 815
Originally Posted by physicsquest View Post
Thanks thats really interesting. Could you manage to read the paper?
Unfortunately no. I'd have to spend 25 dollars which is too much for me. I don't think I could even understand most of the article. But I'd love to read anyway.
I posted this in case someone is interested in reading it and also for people like me that can only imagine how's the article and think about it, developing our imagination.
__________________
Isaac
If the problem is too hard just let the Universe solve it.
arbolis is offline   Reply With Quote
Old Sep 12th 2009, 02:58 AM   #4
Physics Team
 
Join Date: Feb 2009
Posts: 1,425
Am trying to get hold of that paper.

There is this interesting link Information Gain

wherein information is treated as 'minus entropy".
physicsquest is offline   Reply With Quote
Old Sep 12th 2009, 08:27 AM   #5
Senior Member
 
arbolis's Avatar
 
Join Date: Apr 2008
Posts: 815
Originally Posted by physicsquest View Post
Am trying to get hold of that paper.

There is this interesting link Information Gain

wherein information is treated as 'minus entropy".
Indeed interesting.

I don't know if I already gave the following link before... anyway here it comes : Fluctuation theorem - Wikipedia, the free encyclopedia.
I think the fluctuation theorem is more consistent than the Second's law of Thermodynamics because it can quantify a decrease of entropy.
In wikipedia's article there is a link about an experience where the entropy of a macroscopic system decreases over about 2 seconds if I remember well.
Another interesting theorem : Poincaré recurrence theorem - Wikipedia, the free encyclopedia.
__________________
Isaac
If the problem is too hard just let the Universe solve it.
arbolis is offline   Reply With Quote
Reply

  Physics Help Forum > Physics Forums > Physics

Tags
arrow, maccone, time, viewpoint



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
drawing a velocity time graph and displacement time graph. davie08 Kinematics and Dynamics 1 Feb 27th 2011 08:18 PM
Is there a formula that relates frequency and time? By time, I don't mean period, jus rish Waves and Sound 3 Nov 22nd 2009 04:36 AM
Universal Time vs. Earth Time ACS7000 Special and General Relativity 2 Mar 21st 2009 08:34 AM
Velocity-time line/Acceleration-time line graph. ariol Kinematics and Dynamics 1 Jan 8th 2009 10:08 PM


Facebook Twitter Google+ RSS Feed