Natural Science Forum / Physics / Research / April 2008

Hello to all:
I'd like to get some advice on a problem I am presently considering.
Let's consider a Dirac spinor u(p), and for a concrete example, let's
take the u^(1) for an spin up electron, where N is the usual

I'm trying to convince a friend of mine that his "revolutionary energy
saving" scheme is physically ridiculous.  He doesn't take at face
value my claim that the 2nd Law of Thermodynamics prevents it from
working as well as he wants.  My explanation falters because I haven't

Quick question:
For two commuting three-vectors A and B, the cross product
AxB = -BxA.
But what if A and B are non-commuting.  Say they are the spin oprator S

When Thorne et al proved that the Einstein-Rosen bridge
interpretation of the black hole paradigm was unstable against
collapse, ie: without the presence of exotic matter to shore it
up,  was their proof itself stable against anything that a correct

A recent newspaper story by Dennis Overbye in the New York Times
http://www.nytimes.com/2008/04/17/science/space/17dark.html
(probably needs signup-for-user-tracking-registration to view)
and elsewhere

I find different answers:
((Classical electrodynamics))
v < c
((Relativistic Quantum Mechanics))

I am a student at Cal Poly Pomona -- http://www.csupomona.edu .
In the fall of this year I plan to take Physics 121 and the lab class
that goes along with it. I have a learning disability called Asperger's
syndrome which decreases my attention span and makes difficult for me do

I propose a non-symmetric theory of gravitation which complies with Albert
Einstein's last paradigm attempt.
I show that this proposal could explain the acceleration of the universe
without dark energy.

Hi lads,
I've been reading the other thread "...intrinsic vs orbital
angular momentum..." which talks about spinors, r x p, etc, etc.
It mentioned ch41 of Misner, Thorne & Wheeler's "Gravitation"

Referring to the link below:
http://farside.ph.utexas.edu/teaching/qm/lectures/node40.html
it is stated as follows in about the middle of the page:
"Spin angular momentum clearly has many properties in common with

In their original paper the authors derive a phase between the
acceleration of the source and the advanced wave at the source coming
from the absorber. This phase is needed in order to conclude that the
reaction is proportional to the time derivative of the acceleration

I am a student working on certain problems in quantum scattering and
am on the lookout for a good, comprehensive and up to date textbook on
the subject. Something that covers both classical and quantum
scattering in depth and offers insights into modern techniques like

If you take a sphere of a given Radius (R) and Density (D) and have a
photon travel out from the center, it will experience a gravitational
redshift according to Zg=4.19GDr^2/c^2  (where  r is the distance
traveled from the center and is less than R at this point,   r < R ).

I have a Ph.D. in chemistry and have studied relativistic and electron
correlation effects in atoms and during my studies I have been trying
to figure out some details regarding nuclear stability. Given the
cosmic significance of Be-8 instability in big bang nucleosynthesi is

I'm trying to understand the distinction between local and global
constants of motion. Thirring's Classical Mathematical Physics (http://
books.google.com/books?id=NFdStDHPOfcC pg 44) gives the 1-D harmonic
oscillator as an example.