Recent content by Red5

There is a lower limit, called the GHZ limit, which occurs in high-energy astrophysics and results in pair production from interaction with background radiation

No, the photon is the boson which is exchanged by charged particles, from which the EM forces arise, have you read Feynmans QED? I think you'd enjoy it!

Ashcroft and Mermin is very comprenshive, Kittel is excellent too

Hi, I am starting a PhD this year and I don't actually remeber having to put down any of my GCSE results, they are interested in your ability at Physics, not your interpretation of Simon Armitage! The forms are online for most universities if you wanted to check, but I wouldn't worry, just get...

The change is in the coupling constant, which we write as eQ, Q is different for different particles, i.e -1 for the electron 2/3 for the up quark... What happens is that a quantity e^2/4\pi called alpha changes with energy, so that at very high energies electrons will interact with other...

Don't be alarmed by the term "virtual" a virtual particle is simply part of an internal process and as such never emerges as final state particle (which are the "real" particles). Electrons interact with photons via the electromagnetic force. In the language of modern particle physics each force...

pQCD works in the perturbitive region where \alpha_s the strong coupling constant is small, Matrix elements for physical processes are obtained from expansion in this parameter. NRQCD works as an effective field theory for quarks with velocities much less than the speed of light and the results...