In the first lecture of the series Professor Susskind explains the historical origins of string theory. Hadrons are observed to come in angular momentum sequences where a plot of angular momentum against mass squared is a straight line. These plots are known as Regge plots. A mechanical model that matches the observed straight line is a stretchable string connecting two masses. The lecture ends with a model of the relativistic motion of such a string.
- Mesons as quarks connected by strings (gluon tubes)
- The infinite momentum frame, also known as the light cone frame
- The Hamiltonian of a string