Our stringy Universe from a conservative viewpoint
Thursday, November 24, 2005
If you're just waiting for your turkey, you can try to destroy some pairs of letters.
Explanation: the letters are elementary particles. Your goal is to construct tree level Feynman diagrams that pair-annihilate the particles. The only vertex is a quadratic vertex with a coupling "lambda" and the angle 90 degrees in it and your Feynman diagrams must be suppressed at most by "lambda^2".