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Natural Science Forum / Physics / Research / May 2007



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ThreadLast Post  Replies
Desperately Seeking Spinors31 May 2007 21:17 GMT18
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.
Statistical mechanics without probability29 May 2007 22:30 GMT6
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
Question about Magnetic Radio Signal in Outer Space29 May 2007 22:30 GMT1
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
Massive and massless partciles29 May 2007 04:17 GMT1
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:
Re: 1996 Challenge question25 May 2007 19:33 GMT3
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 ...
SU(N)25 May 2007 00:57 GMT1
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|)
Maxwell's Wave Equation and Degrees of Freedom?19 May 2007 02:51 GMT13
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
Could the right handed neutrino be the dark matter?16 May 2007 23:44 GMT2
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
Questions about Bose-Einstein condensation16 May 2007 10:43 GMT1
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
question about correlations in spin measurements16 May 2007 00:56 GMT1
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
big-bang as electromagnetic pulse?15 May 2007 11:15 GMT2
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
horizon problem13 May 2007 14:18 GMT5
Can someone explain, please, why the so-called horizon problem is such
for the understanding of the universe?
Thanks
Enrique Vela
help make working with anesthetics safer12 May 2007 16:11 GMT6
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
photon's wavefunction11 May 2007 13:24 GMT10
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.
Is the gravitational force between scalar fields proportional to mass^2?11 May 2007 13:24 GMT2
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
Pages: 1 2 April, 2007
 
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