Today I am beginning a long sequence of articles that will allow me to address some very basic and easily misunderstood concepts in physics: mass, energy, matter, force, and so on. Along the way I will be dealing with some of the questions that readers have been asking me, such as whether mass and energy are or are not fundamentally the same; why the neutron is stable inside many atomic nuclei even though it decays when it is on its own; why the proton has a mass which is larger than those of the quarks that it contains; etc. I’ve just completed the first link in this long chain, an article on the annihilation of particles with anti-particles. I’ve described some (not all!) of the rules that govern this process, which is one of the most important in all of particle physics. (You can also read a shorter and older article about anti-particles here.)
First Time Visitor?This site addresses various aspects of science, with a current focus on particle physics. I aim to serve the public, including those with no background knowledge of physics. If you're not yourself an expert, you might want to click on "New? Start Here" or "About" to get started. If you'd like to watch my hour-long public lecture about the Higgs particle, try ``Movie Clips''.
- Has a New Force of Nature Been Discovered?
- The New York Times Remembers A Great Physicist
- A Catastrophic Weekend for Theoretical High Energy Physics
- A Ring of Controversy Around a Black Hole Photo
- The Black Hole `Photo’: Seeing More Clearly
- The Black Hole `Photo’: What Are We Looking At?
- A Black Day (and a Happy One) In Scientific History
- A Non-Expert’s Guide to a Black Hole’s Silhouette