Description:
Current physics research. (Moderated)
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relation between quantum mechanics and classical mechanics
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Hi, This post concerns the relation between quantum mechanics and classical mechanics. One can find many statements of the kind: "Quantum mechanics is the covering theory of classical mechanics", or "The classical limit of quantum mechanics is classical mechanics". in the literature. I have the following 2 problems... more »
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Planetary drift
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I have a question that I have no seen asked before, let alone answered. It concerns the effect of quantum randomness (or at least, non deterministic randomness) on planetary positions given that the solar system exhibits chaotic phenomena in a multibody gravitational interaction. If we take the position of (say) Earth at t=0 and later at t=n seconds... more »
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Double hole experiment
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Please do not reply to this post unless you have actually done the experiment. I am looking for first hand information, not something in a text book. In his Messenger Series of lectures presented in 1964, Richard Feynman describes a double hole experiment which I will outline in this posting. If... more »
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Quantum Field Theory: The Big, Simple Picture?
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I have been studying quantum field theory for about two years now, and for all the drama and encyclopedic tomes about quantum theory, it seems to me that there is really a very simple and clear line between classical and quantum theory, at least when one views QFT through the lens of Path Integration.... more »
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Renormalization Grounded in Classical Field Theory -- Mass Shift vs.
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[[Mod. note -- I apoloigise to the author and to s.p.r readers for the long delay in approving this posting, which was originally dated Tue, 10 Nov 2009 13:23:30 -0800 (PST). The delay was due to a mixup on my part in saving the incoming message to the wrong mailbox. -- jt]] This is another in a series of articles I've recently posted on this... more »
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Replica Limit vs. thermodynamic limit
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[[Mod. note -- I apologise to the author and to s.p.r readers for the long delay in approving this posting, which was originally dated Tue, 10 Nov 2009 18:03:35 +0100. The delay was due to a mixup on my part in saving the incoming message to the wrong mailbox. -- jt]] Hi there, in the theory of quenched disorder in statistical systems... more »
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Time arrow and causality
 
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Dear all, A colleague of mine guesses that the time arrow is caused by the asymmetry of causality (cause and effect are not interchangeable), while the relationship to the invariance against time reversal of equations is not so tight. What do you think? Thank you and best wishes, Peter
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Spasers for Solar Energy Intensification?
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I have often wondered if nano technology might allow for the development of a material that would soak up solar energy without focusing mirrors for some period of time . . . all day for instance. The material would be "pumped up" so to speak. It could then be "spas'd"(surface plasmon amplification by stimulated emission'd) to... more »
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