Natural Science Forum / Physics / Research / February 2008

February 20, 2008
Hello,
    I am currently working through a copy of _The Physics of Time
Reversal_ by Sachs. Sachs often refers to an "equal time commutation

From 2001 December 14, sci.physics.research
http://groups.google.com/group/sci.physics.research/browse_thread/thread/6a23142
6b3a313c0/4b63fb3c38091eb8?hl=en&lnk=gst&q=Fancy+Schmancy+Forms#4b63fb3c38091eb8
From b...@math-cl-n03.math.ucr.edu (John Baez):

Does a photon (free - plane wave or/and confined - a wave packet) has
an EM field.
How does it look like if one can measure it in space and
time?

Hi, I tried this in s.p.condensed-matter, but maybe I'm better off here
because this group is actually active.  Here we go...
So if you are doing microscopy though a gas flow-cryostat and it looks
like your subject is below the surface of a pond, it likely means you

I want to dump the  spettra taken by a Network Analyzer HP3577A into a PC
using a GPIB interface.  I'd like to do it with labview. I found some
labview drivers on the web but no one works. I have been working on this
problem for days but I do not manage to find satsfatory ...

I am currently working my way through classical Yang-Mills theory with
the help of John Baez's book on gauge fields and some others.  I have
recently just began to notice the new, well new to myself, research on
higher gauge theory.  This looks very interesting but I feel that my

Any suggestions as to which grad schools are active in the field of
quantum information/computation? Preferably in North America but
possibly also in Europe/Australia...
I am asking in view of applying for a Ph.D. in Quantum Information

I've been trying to better understand the relativistic origin of
magnetism.  I tried to do a slight variation on a common derivation
and got an unexpected result.  I'm hoping someone here can point to an
error I made.

I am far from being a physicist; however, I am well-read with respect
to a great deal of the infromation, not only that which is available
to the lay-person, but also text materials that I have collected
through the years. And, although I do admit that much of what we

    I am looking for a precise definition of "quantum efficiency"
of photon detectors, and also for information on how this is
measured in practice.  The context is the following.
    "Entangled" pairs of photons are generated by "parametric

how heat will transfer in fast moving bodies?

Does anyone know of a book that discusses the ways that physicists are
sloppy with mathematics?

I would like to describe a bit of my own field of research (years of
work, you know), and ask if somebody else are interested in the same
ideas (?!) -If it's the case, I would really like to make some
connections...

I have been trying to work out the mathematical details of H Snyder's
1947 paper, titled Quantized Space-Time
(http://prola.aps.org/abstract/PR/v71/i1/p38_1),
and I am stuck at something.