Natural Science Forum / Physics / Research / August 2006

What is the status and opinions on "mirror matter" (Foot et el) as a
candidate for "dark matter"?

Theoretically, the Electrical (E) field associated with a conductor is at
exactly 90 degrees with respect to that conductor.
It appears, however, that real conductors behave diffeeently and that the E
field associated with a real conductor is at an angle that is slightly

Does anyone have any ideas about what the commutation
relation of [x_i, P*P] should be for a single,
relativistic particle (e.g. an electron)?
I've been arriving at an apparent contradiction, and

What is the aspect of topology for studying cosmology?

Hello. I'm finishing an undergraduate research project on lattice
gauge theory, and I have a question about spin network states: in
short, is there any efficient method for evaluating them when some
random group elements g_1, g_2, g_3... are assigned to the edges,

Hi, I'm very interested in quantum gravity and cosmology, but in my
country there is no one who can guide me in this subject. So I was
wondering if someone could give me some advice about review papers and
books to begin. Actually I've found many, but don't know where to begin.

I have several magnets (bars) of well known size.
These magnets are placed on a table and they can rotate around their
center until they reach a stable state.
I want to know if there are some mathematical formulas which can

Are apparent forces due to the expansion of the universe considered in
cosmology?
Here is an example:
suppose a hypothetical galaxy with a dense center surrounded by a thin

Hi everyone! I have a few questions regarding renormalization in QFT.
1. In Peskin chapter 10, he renormalizes phi^4 theory using the
renormalization conditions in equation (10.19), which basically say
that the propagator has a pole at p^2 = m^2 and that the 4-point

Dirk Bruere at NeoPax <dirk.bruere@gmail.com> writes

I'm a high school student, and I constantly study all types of science.
Over the summer I've been focusing on atomic theory and read about the
law of conservation of baryon number, explaining why protons are
stable.

I've been looking for an answer to two questions regarding the 2-slit
experiment (showing both wave and particle properties of light). I hope
someone here might know how to respond.
Quick review of what I believe I know: Shooting a single photon (or

take non-relativistic quantum mechanics. The probability amplitude that
a particle with position |q> at time t will have position |q'> at time
t'>t is given by
<q',t'|q,t> = <q'|exp(-iH(t'-t))|q>              (1)

I'm currently brushing up on my rather dated knowledge of atmospheric
plasmas and would appreciate a bit of help.
While I'd welcome suggestions of links or books to bring me up to date,
at the moment I'm particularly interested in the modern view on two

I've found several papers concerning decomposition of an arbitrary
unitary matrix to a corresponding quantum circuit. But there is
basically no (useful) code for this purpose...
So I'm looking for corresponding implementations in C/C++, Matlab or