John Conway and Simon Kochen invented a theorem, about "free will" or "free whim", at choice. http://www.cs.auckland.ac.nz/~jas/one/freewill-theorem.html (I'm...
Welcome to all the new members we had in the month of December, January, and February. We hope your stay with us will be fun, enjoyable, exciting, educational,...
There is a followup/update/whatever to this. Piers Coleman and Andrew Schofield wrote a nice summary on Einstein's role in the study of quantum criticality in...
This is just at my university. In fact there was a seminar on it about a month ago that I failed to attend due to prior commitments. I can dig around for...
Hello all, I'm taking a computational physics course this semester which requires a final project. I've been considering implementing a simulation of a...
... requires a final ... problem that's always ... the center), then ... cones with some ... fall at a near- ... angles take ... reach it at all. ... subset...
Vega Science Trust, a nonprofit organization in the United Kingdom, has a collection of science videos that one can view right on the web (you may need a Real...
Hello guys! I was pondering about distorted space-time and thought of a theoretical experiment... I don't know if this has already been answered or discussed...
Hi, I must say that it was a very clever thought experiment but in my opinion the solution is that you can never rotate that rod at 1 cycle/sec. The rotational...
What about if the length of the rod is much much shorter so that the speed at its end is less than c? Let's say 1/4 or 1/3 of c and that a "special machine"...
In addition to the answer given by boomor, there is another point that you have overlooked. A "rod" is made up of atoms and molecules that are being held ...
The "bending" of the rod due to the "lag" of the forces between the atoms in the rod (see prev. post by Zapperz) should be neglectable if one applies a...
Another follow up to this saga. Someone on Physics Forums (PF) pointed out that Kastner's argument against Afshar's interpretation seems to use Cramer's...
So not many people attempted this one, which, I think, isn't too surprising for me. ... its ... temperature. ... to ... superconductivity ... ones. There are...
A carbon is a carbon, of course, of course.... But is it really? A diamond is one of the hardest substance known. It also has many other physical properties...
I know that there are people here who either have attended, or will be attending conferences and activities that are connected to the official World Year of...
Again, this took a while, but here it is. For those of you who wish to catch up on the previous chapters of this on-going series, you are welcome to check...
So Zapper, how many times did it take for *YOU* to pass this big exam? Bobby ... Granted, this is probably the biggest obstacle you will ever face in your...
Hey, try not to miss this essay written by Markus Arndt and Anton Zeilinger in this month's issue of PhysicsWorld. http://physicsweb.org/articles/world/18/3/5 ...
Last week's vexer is difficult if you are not familiar with a bit of solid state physics, or did not do some research on your own by googling it. ... It ... a ...
I'm not sure how well this will go, but what the heck.... In a typical single-slit experiment with a monochromatic light souce, you place a single slit in the...
OK, I've been sitting on this for some time, and the news report has been out for at least a couple of weeks, so most of you probably has seen it. First of...
16 March 2005 1820 GMT +0100 I heard that publication was forthcoming, though unfortunately didn't catch the reference ... why not send a quick line over to...
... I suppose you mean this would be a setback for MWI iff you believe in the "quantum eraser" experiment that supposedly can be a test between MWI and the CI....
I shelled out the $83 to amazon to get a copy of Everett's original dissertation, as well as a few other articles on the MWI, in [1], and it finally arrived...
... has ... has ... being ... no ... It sounds roughly similar to a two slit diffraction experiment but doesn't seem like an exact analogy. In principle if a...
Roger Penrose makes a guest star appearance. Carolin Crawford is an excellent communicator of complex physical concepts. You can listen to it from this link : ...
Measure theory, also known as probability theory (although they have different connotations), was invented to generalize the concept of counting. The same set...
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