Description:
Current physics research. (Moderated)
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Mathematics and Information
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Not quite sure how to phrase this since it's a question I have ever seen asked... Is here a minimum amount of information/entropy/energy associated with the creation/discovery of a given mathematical theorem? I assume a practical minimum is the amount of information required to store the result, but its derivation?... more »
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Numerical Simulation Density Profiles
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What's the difference b/t a "density profile" or "temperature profile" etc and just a basic density graph, temperature graph, etc? (Cosmological simulations). Is a profile a graph over a chunk of space which is 2-dimensional plus width-not-too-small /large, whereas a graph is just a 2-dimensional plot, y vs. x, say.... more »
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MOEPED 6 Update: 3 to 1 ultracapacitor bank
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Usenet discussions of the MOEPED ((MObile Experimental Physics Educational Demonstrator) human/electric hybrid bicycle series go back to 1999-05-05 in the Google Groups archive: [link] The vehicles entertain and educate bicycle riders, alternative-energy... more »
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Density, Temperature Profiles
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What's the difference b/t a "density profile" or "temperature profile" etc and just a basic density graph, temperature graph, etc? (Cosmological simulations). Is a profile a graph over a chunk of space which is 2-dimensional plus width-not-too-small /large, whereas a graph is just a 2-dimensional plot, y vs. x, say.... more »
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Question about the contracted Christoffel Symbols
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Are the contracted Christoffel Symbols vectors? A quick glance at the transformation properties of the Christoffel Symbols seems to suggest that the non-homogeneous part of the transformation would vanish under contraction by simply applying the chain rule. However, I have not been able to find a verification of this in any textbooks or online.... more »
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What it's like to Travel on a Light Beam
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What it's like to Travel on a Light Beam [link] (PDF, 105k) Maxwell s equations, in the form actually published in his 1867 treatise, explicitly broke boost-invariance with the incorporation of an absolute velocity vector G. However, as more recently argued by... more »
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is it true that when symmetry breaks, that which is invisible becomes
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Dear Physics Gurus and others I have a question about statement that I read on a website about a year ago. The statement was about that when symmetry is broken, that which is invisible becomes visible. My question is if this is true, and if it is, can you provide an example (preferably not too complex) of a case in which this can be... more »
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Interesting paper
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Hi everyone: Has anyone looked at this paper by Claus Turtur. It is called a "A Motor driven by Electrostatic Forces". The paper is posted at philica.com. It should be available at this link; [link] The paper claims to describe a type of motor that seems to operate... more »
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