US sees fall in foreign physics students

Human Rights in US Foreign Policy

Physics 215 A QFT Fall 2017

(a) Draw the Feynman diagram which gives the leading contribution to the process φφ→ φφ. (b) Derive the correct sign of the amplitude by considering the relevant matrix elements of powers of the interaction hamiltonian. (c) Evaluate the diagram in terms of a spinor trace and a momentum integral. Do not do the momentum integral. Suppose that the integral is cutoff at large k by some cutoff Λ. Es...

A Periodical of Particle Physics Fall

Physics 215 A QFT Fall 2017 Assignment

(a) What symmetries do these charges generate (i.e. how do the fields transform)? Show that they are symmetries of S. (b) If you want to, show that [Q, H] = 0, where H is the Hamiltonian. (c) Evaluate [Q, Q]. Hence, non-Abelian. (d) To complete the circle, find the Noether currents J i μ associated to the symmetry transformations you found in part 1a. (e) Generalize to the case of N scalar fields.

Can Physics Make Us Free?

A thoroughly physical view on reality and our common sense view on agency and free will seem to be in a direct conflict with each other: if everything that happens is determined by prior physical events, so too are all our actions and conscious decisions; you have no choice but to do what you are destined to do. Although this way of thinking has intuitive appeal, and a long history, it has rece...