| Thread | Last Post | Replies |
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| Desperately Seeking Spinors | 31 May 2007 21:17 GMT | 18 |
I've read the text books and searched the web, but I still have not achieved enlightenment. I have a PhD in maths and I am not yet entirely senile. I have elementary knowledge of Clifford algebra.
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| Statistical mechanics without probability | 29 May 2007 22:30 GMT | 6 |
I'd like to ask for feedback on my paper ''On the foundations of thermodynamics'', available from http://www.mat.univie.ac.at/~neum/papers/physpapers.html#eq If you ever had misgivings about the treatment of thermodynamics
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| Question about Magnetic Radio Signal in Outer Space | 29 May 2007 22:30 GMT | 1 |
Let's say I am in a space station which has a supercooled 150 KHz DX analog receiver that receives the magnetic fields [while ignoring the electric fields] of extremely weak 150 KHz AM analog carrier signals. In addition, this receiver is so sensitive and powerful that it can
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| Massive and massless partciles | 29 May 2007 04:17 GMT | 1 |
Suppose we have a system consisting of an on shell massive particle with momentum p^u such that p^u p_u = m^2 and an on shell massless particle with momentum q^u such that q^u q_u = 0. The center of mass squared is:
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| Re: 1996 Challenge question | 25 May 2007 19:33 GMT | 3 |
This is in response to a very old post which can be found at: http://groups.google.com/group/sci.physics.research/browse_thread/thread/46cb86e ae26b4190/8096632ed0fd229b?lnk=gst&q=1996+challenge+question&rnum=1 quoted text--------------- Perhaps this may not be the place for the ...
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| SU(N) | 25 May 2007 00:57 GMT | 1 |
What is the analogous of Pauli matrices (summation implied for repeated indices) exp(i s_i theta_i) = cos(|theta|)+i s_i (theta_i/|theta|) sin(| theta|)
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| Maxwell's Wave Equation and Degrees of Freedom? | 19 May 2007 02:51 GMT | 13 |
Dear friends: Maxwell's equation is often written as J^u = d_v d^v A^u where A^u is the photon potential and J^u is the current. Because the current is conserved, d_u J^u = 0, we know that J^u has
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| Could the right handed neutrino be the dark matter? | 16 May 2007 23:44 GMT | 2 |
According to the SO(10) grand unified theory, there is a field which is invariant under SU(5) and hence it is a singlet under SU(3)*SU(2)*U(1). In other words this field does not participate in the strong, weak, and electromagnetic interactions. Thus, this field
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| Questions about Bose-Einstein condensation | 16 May 2007 10:43 GMT | 1 |
Questions about Bose-Einstein condensation: (1)In a Bose-Einstein condensate,all the bosons are in the ground state. Can the ground state has degeneracies? If the answer is positive, the bosons could be in different states and are no longer
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| question about correlations in spin measurements | 16 May 2007 00:56 GMT | 1 |
I have a question about a thought experiment described in Gerard 't Hooft's paper ``Can Quantum Mechanics be reconciled with cellular automata?", which is available in PDF format from: http://www.phys.uu.nl/~thooft/gthpub/digit01.pdf
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| big-bang as electromagnetic pulse? | 15 May 2007 11:15 GMT | 2 |
12-MAY-2007 Hello - I was wondering: can the big-bang be idealized as an electromagnetic pulse? Or perhaps more appropriately, would there be a pulse
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| horizon problem | 13 May 2007 14:18 GMT | 5 |
Can someone explain, please, why the so-called horizon problem is such for the understanding of the universe? Thanks Enrique Vela
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| help make working with anesthetics safer | 12 May 2007 16:11 GMT | 6 |
Good day, I work in medical research with mice and rats. My work often involves anesthetizing rodents with isoflurane (the same type of gas anesthetic that is used in human medicine). The animal is placed in a small box
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| photon's wavefunction | 11 May 2007 13:24 GMT | 10 |
What is the coordinate representation of the wavefunction of the photon in QFT? According QFT the wavefunction of a single photon is a+/0> where a+ is the creation operator of the photon and /0> means the vacuum state.
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| Is the gravitational force between scalar fields proportional to mass^2? | 11 May 2007 13:24 GMT | 2 |
It is known that the gravitational force between two static point particles is proportional to the masses. Now let's consider a scalar field interacting with gravity. The scalar field part of the action is of Klein-Gordon type. Of course we must
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