We are all familiar with velocities. Velocities tell us how positions change with time. Velocities can not be assigned to individual objects, as they describe a relation between pairs of objects. We…

Last week I spent a few interesting days in the pleasant winter setting of Engelberg, a mountain location in the Swiss alps. There I attended the CHIPP 2012 winter school, an event organized by…

First I will play the old gauge symmetry game repeated everywhere for EM. I will then teach that old dog a new trick that ends up with the same bone. I will then struggle a little over the lingo to…

The CMS Collaboration has just released the results of a deep study of their sample of lead-lead collisions, produced at a center-of-mass energy of 2.76 TeV per nucleon by the Large Hadron Collider.…

The CHIPP 2012 winter school of particle physics is over, and so is the 50th winter meeting on nuclear physics. The two events had three things in common: they were both held in renowned locations…

I read ArXiv regularly. It's not easy because most of the latest publications of physics go there before print. Apart from pedagogical articles (for teaching purposes), all the articles are aimed at…

Fire a machine gun at a wall with two slits. Look at the pattern bullets make that pass through. The pattern is the sum of two Gaussian curves. Classical physics makes sense. Repeat the exercise…

A particle which flies from a point C to point L in the Earth gravitation should submit to the brachistochrone problem decision.  Well-known that the particle flying in a gravitational field of…

This week's edition of the CMS Times features a short piece by A.Rao,  where some points are made on the issue of correct statistical analysis of high-energy physics data. If you read the piece…

“The vacuum is empty” Richard Feynman According to Dick himself, this was his catchiest motto, but eventually he abandoned it for being as wrong as it sounds right.   There are several…