My Introductory String Theory Course Summary, Princeton University December 28, 2013.. Jorma Jyrkkanen

Summary of my Thoughts on Finishing Susskinds 10 Lecture String Theory. jjyrkkanen76@outlook.com 28 Dec 2013 Finished the String Theory course put on by Leonard Susskind at Princeton. Whew. Beauty. Wish I could just blurt out what I Iearned. It was a whole pile of pretty insightful physics. Maybe I will find time one day to translate some of the high points. Rooted in least action principles, Lagrangians and Hamiltonians, it links to energy, momentum, proper time and relativity and quantum mechanics and is solid. So is the fact that the four forces are unifiable under string theory, a result Einstein spent his post dissertation life searching for incidentally discovered theoretically by Schwartz and Green. It provides an explanation for relativity, Dn-Branes and QED, QCD, hadrons, photons, electrons, positrons, gravitons, gluons and that whole family and is simply beautiful as a theory being invariant under transformations. From Dn-Branes comes the surprising discovery that Feynman diagrams can arise naturally and easily from string theory. Compactification of dimensions is lovely to watch infold explained beautifully by conformal mapping. String Theory does generate a monopole, a very exciting development for physics. Branes which arose naturally from string theory are now the best way to study QCD. Two open strings comer together in space time moving to the right and are mapped by conformal mapping onto a sphere. The four foci on the sphere are the four momenta at the infinity ends of the strings in purple. I call this the butterfly. In our course students called it the sports bandage.

2DOpenStModel

Image Where string theory needs attention is in xplaining the masses of the particles and the best hope for this in my view is from the winding and conjugal progeny of transition through Calabi-Yau manifolds of which there are probably 10^500 and likely there exist as many universes. Also the graviton may be hitch hiking along on massive strings and I suspect are there creating hybrid angular momenta which might be diagnostic. The finding of Higgs field explained a good deal of the mass and virtual particles explained more and dark matter explained the remainder. Tags:Jorma Jyrkkanen, physics, QM, relativity, String Theory, Supersymmetry, Susskind, TOE