Robert L. Oldershaw wrote: A new submission to hep-th at arxiv.org presents an interesting challenge: Sort of a 'Where's Waldo?' except that...

Also available at http://math.ucr.edu/home/baez/week286.html December 8, 2009 This Week's Finds in Mathematical Physics (Week 286) John Baez This Week I'd like to start...

Also available at http://math.ucr.edu/home/baez/week285.html December 5, 2009 This Week's Finds in Mathematical Physics (Week 285) John Baez A while back, my friend Dan...

I'm somewhat unclear about Quantum Teleportation. I think that there is a distant and instant change in the quantum state (QS) in the teleportation scheme on bob 's...

Is there a variant of Grover's algorithm that would work on something like a real database? In the simplest case (which happens to be the one I'm interested in), the...

I like asking sensible questions here because they usually bring out the worst in the people who try to answer them. This one will again test your physics knowledge. It has...

From the abstract of http://arxiv.org/abs/0905.3905 "We give one of the first known arguments for the origin of the three observed gauge groups. The argument is based on...

Hi, This post concerns the relation between quantum mechanics and classical mechanics. One can find many statements of the kind: "Quantum mechanics is the covering theory...

Reposting from news:rec.crafts.metalworking, where there were no replies: For a delightful demo of Curie point of steel...

Let us consider the annihilation of an electron and a positron into a pair of photons in relation to Feynman's Diagerams. Carerful consideration of the energy-momentum...

I have been studying quantum field theory for about two years now, and for all the drama and encyclopedic tomes about quantum theory, it seems to me that there is really a...

Virtual Photons are responsible for electromagnetic interactions which extend for an infinitely large distance.When these virtual photons are shot out of charged particles...

Hi to you all! below, ~ stands for "proportional to" , and R stands for Riemann's spacetime curvature tensor. Here is my question: 1) According to Unruh, a rocket with ...

Dear Friends: I have often made reference to the textbook by Anthony Zee, Quantum Field Theory in a Nutshell. One of the things I find very attractive about this book is...

Is it possible that prefect reversibility is a mathematical ideal that does not apply exactly to any system found the the real world of nature? Did Poincare already discover...

Why does the renormalization group work so well? In fact, why does it even work at all? Before you think this is a dumb question on my part, please consider this for a...

Hi! Please, can someone tell who were the first persons to establish that W = F d and Kinetic energy KE = (1/2)mv^2? Thank you.

I have attempted a simple thought experiment with buoyancy and density changes and have attempted to model the situation mathematically. The main objective have been to...

In the course of working through a physics exercise, I have come across the need to evaluate the Fourier transform of the general form: F(x^-(n/m)) = $ x^-(n/m) exp^-x.w dx...

If one were to use the Einstein-Hilbert action in the usual expression for a path integral, where the metric tensor g_uv (or at least its gravitational field components...