## String Theory and M-Theory

**String Theory and M-Theory (Fall 2010, Stanford Univ.)**. In this set of lectures Professor Leonard Susskind gives an introduction to String Theory,
which he describes as a mathematical framework for theories that unify all the forces of nature, including gravity. In string theory, fundamental objects are
no longer point particles; instead they are strings or higher dimensional objects called D-branes. These objects also require additional ingredients such as
extra spatial dimensions. (from **theoreticalminimum.com**)

Lecture 01 - The historical origins of string theoryThe historical origins of string theory, Mesons as quarks connected by strings (gluon tubes), The infinite momentum frame, also known as the light cone frame, The Hamiltonian of a string. |

Lecture 02 - Mathematics of string motionDirichlet and Neumann boundary conditions, Fourier series, The open string, The energy levels (excitations) of a string. |

Lecture 03 - The energy spectrum of stringsThis lecture develops an algebraic approach to the energy spectrum of strings. Raising and lowering operators are associated with the modes of the strings. The lecture finishes with the basics of string interactions. |

Lecture 04 - Closed strings and the level matching ruleWhy is charge quantized? Noetherâ€™s theorem and conserved charges, A model of closed strings, The energy spectrum of closed strings, The level matching rule. |

Lecture 05 - Bosonic stringsExamining the ground state of bosonic strings, Planck units, The introduction of additional dimensions in which the string can vibrate or stretch. |

Lecture 06 - String with spinString mass points with spin, A review of particle scattering, Meson scattering and the Veneziano amplitude -- string like, String scattering concepts. |

Lecture 07 - Fermionic strings and path integralsThe ground state of Fermionic strings, The action for a string, Path integral review, Path integrals in string theory lead to the Laplace equation. |

Lecture 08 - Conformal mapping and string scatteringConformal maps and analytic functions, Analytic functions produce conformal maps, Linear fractional mapping, String scattering concepts. |

Lecture 09 - Strings in compact dimensionsStrings moving on a sphere, Periodic dimensions, Quantizing string motion on a torus, The duality of winding and quantized momentum - T-duality. |

Lecture 10 - T-duality, D-branes and modeling field theoriesLeonard Susskind continues his discussion on T-Duality; explains the theory of D-Branes; models QFT and QCD; and introduces the application of electromagnetism. |

Lecture 11 - String theory wrapupThe theory of reductionism, The end of reductionism, Geometric gymnastics with strings and D-branes. |

References |

String Theory (Fall, 2010) | The Theoretical MinimumIn this set of lectures Professor Susskind gives an introduction to String Theory, which he describes as a mathematical framework for theories that unify all the forces of nature, including gravity. |