Can anyone please briefly explain as to what role fourier transforms play in x-ray crystallography ? Suggest some books or online links to know more on this aspect ...

I am interested if there is any change in the status of the standard model of the electro-weak interaction due to the experimentally/observationally confirmed non-zero mass...

When the SU(2) symmetry is broken by the Higgs mechanism, the W bosons acquire mass and become the well-known W^+ and W^- bosons discovered at CERN in the 1980s. So before...

The EPR paradox argues that quantum mechanics cannot describe all elements of reality, and so is incomplete. Bohr replied, in part, that it describes all actually measured...

I am seeking distance-learning (i.e., Web-based) distance learning programs in physics, in pursuit of an M.A. or M.S., from legit, accredited colleges or universities. ...

Hi! Does anyone know of any QED simulation program or text which is more aimed towards understanding the principles than giving cutting-edge results ? When searching for...

In both the Klein Gordon equation and the Dirac equation, when one introduces the electromagnetic potential, A, one encounters a term: (nambla A)psi can one - at this point...

Third International Quantum Interaction Symposium (QI-2009) Call for Papers March 25 - 27, 2009 DFKI Saarbruecken, Germany Conference web site:...

To all: With some good advice along the way from Nuropulp in some recent threads over at sci.physics.foundations, I have been studying Foldy-Wouthuysen transformations and...

Some have suggested, (I'd say most) that the Hilbert space for a single relativistic massive particle is the set of L^2 functions on the mass hyperboloid, with the measure on...

Just a thought everyone - for there to be dark matter and dark energy, must there not then be light energy and light matter? So, if the scientists who think they have the...

Also available at http://math.ucr.edu/home/baez/week268.html August 6, 2008 This Week's Finds in Mathematical Physics (Week 268) John Baez This Week will be all about...

I have a very simple question but one I've not been able to answer by looking in the usual sources. If I have a function f defined by a power series limited by a pole at a...

Hi folks After a long time of research and many e-mails to the powers that be a new version of the relativity FAQ "Does mass increase with speed?" was written and is now...

I need some help in locating ceramic disc magnets that measure 120mm in diameter with no hole in the center. The thickness can be as much as 13 mm 25.4mm. The strrength is...

In Dirac theory, everything is normalized so that the probability (CT = conjugate transpose): $ (psi^CT psi) d^3x =1 (1) The probability density is therefo psi^CT...

Special relativity posits the absence of absolute space. Motion of an inertial reference frame in space cannot be detected. Let me present my new invention (patent pending)...

Some of the later editions of Scientific American's old column "The Amateur Scientist" are once again online. Articles for 1999, 2000, and 2001 are now visible on the SciAm...

Assuming you are limited to an incoherent light source for generating surface plasmons and you want to produce coherent photons from the surface plasmons: I assume the...

Can someone explain to a retired experimentalist why the symmetry group (apparently exact) of "color" is SU(3) rather than SO(3)? Is there some experimental fact that...