Physics

A little group theory a la QFT Demystified. David Tong's Procedure.  The Norm of the quaternion is --------------. The Norm of a biquaternion is --------------. Can I solve a problem is…

Derive SR from 1.Preservation of Causality and 2.The Constancy of the speed of light. with a focus on the spacetime interval. (like Brian Cox)

Since "spacetime" is simply a term for a space that has a component we call "time", we need only concentrate on spaces in a somewhat general sense.  Now, as Derek Potter, on this site, pointed…

I recently found a physics book I've enjoyed so much I'd like to share it with others interested in physics. Because physics is a hobby for me and something I've studied in the past, I enjoy books…

CONTENTSPART A: Introduction: does the inertia of a body depend upon its energy content?PART B: The Toolkit: mathematical and physical assumptions PART C: The Thought Experiment and the Word…

Today I read with pleasure a paper on Supersymmetry which is surprisingly well written and clear. I can only warmly advise anybody seriously interested in the phenomenology of SUSY (in particular,…

The family of Upsilon resonances is among the few things that can always cheer me up and remind me about my fascination for elementary particles when I get bored about my job. The sight of their mass…

Since 1930, efforts have been made to get our best theory for gravity - general relativity (GR) - to work with our best theory for atoms - quantum field theory (QFT) in the forms quantum…

This week's graph comes from a recent publication by the CMS experiment, the one I am a proud member of together with about 3000 colleagues from all over the world. CMS (see a 3-D sketch below) is…

The medium in which light propagates is space. This space can curve. The curvature is not static. So, this space moves. Its behavior can be analyzed by a kind of fluid dynamics. Let us call this…