# String Theory and Holographic Duality

## By Hong Liu

To listen to an audio podcast, mouse over the title and click Play. Open iTunes to download and subscribe to podcasts.

#### Description

This course covers the new field of Holographic Duality, which brings together many seemingly unconnected subjects including string theory/quantum gravity, black holes, QCD at extreme conditions, exotic condensed matter systems, and quantum information. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu

Name | Description | Released | Price | ||
---|---|---|---|---|---|

1 | VideoLecture 1: Emergence of Gravity | In this lecture, Prof. Liu discusses the concept of emergent gravity, and proves the Weinberg-Witten no go theorem which forbids existence of massless spin-2 particles. The beginning of the lecture is devoted to course information. | 2/22/2016 | Free | View in iTunes |

2 | VideoLecture 2: Classical Black Hole Geometry | In this lecture, Prof. Liu first discusses important scales in classical and quantum gravity, and then reviews the spacetime geometry of a black hole. | 2/22/2016 | Free | View in iTunes |

3 | VideoLecture 3: Causal Structure of a Black Hole and Black Hole Temperature | In this lecture, Prof. Liu first discusses the causal structure of a black hole geometry, and that of a closely related spacetime called Rindler spacetime. He also derives a closely related phenomenon: Minkowski spacetime. | 2/22/2016 | Free | View in iTunes |

4 | VideoLecture 4: Physical Interpretation of Black Hole Temperature | In this lecture, Prof. Liu gives a physical interpretation of the black hole temperature, and similarly the temperature experienced by an accelerated observer in Minkowski spacetime. | 2/22/2016 | Free | View in iTunes |

5 | VideoLecture 5: Black Hole Thermodynamics | In this lecture, Prof. Liu first discusses four laws of black hole mechanics, and then relate them to laws of thermodynamics. He also outlines black hole information paradox. | 2/22/2016 | Free | View in iTunes |

6 | VideoLecture 6: Holographic Principle | In the first part of this lecture, Prof. Liu explains physical motivation behind the holographic principle, and a formulation of the principle. In the second part, he starts a new topic on the large N limit of a non-Abelian gauge theory. | 2/22/2016 | Free | View in iTunes |

7 | VideoLecture 7: Structure of Large N Expansion | In this lecture, Prof. Liu continues discussion of theories whose fields are built out of matrices. When the rank N of the matrices become large, observables can be expanded in 1/N. | 2/22/2016 | Free | View in iTunes |

8 | VideoLecture 8: Large N Expansion as a String Theory, Part I | In this lecture, Prof. Liu connects the topological expansion of a matrix field theory in 1 / N to the perturbative expansion of a string theory. The structure of perturbative expansion of a string theory is explained from first principle. | 2/22/2016 | Free | View in iTunes |

9 | VideoLecture 9: Large N Expansion as a String Theory, Part II | In this lecture, Prof. Liu wraps up the mathematical connection between 1/N expansion of a large N matrix field theory with the perturbative expansion of a string theory. The second half of this lecture is an introduction to string theory. | 2/22/2016 | Free | View in iTunes |

10 | VideoLecture 10: Basics of String Theory and Light-cone Gauge | In this lecture, Prof. Liu first introduces general setup of string theory, including various forms of the string action and symmetries of the action. He then solves classical string dynamics in the light-cone gauge. | 2/22/2016 | Free | View in iTunes |

11 | VideoLecture 11: String Theory in the Light-cone Gauge | In this lecture, Prof. Liu first finishes discussing class string dynamics in the light-cone gauge, and then proceeds to quantize the theory in the light-cone gauge. | 2/22/2016 | Free | View in iTunes |

12 | VideoLecture 12: String Spectrum and Graviton | In this lecture, Prof. Liu first discusses closed string spectrum obtained from light-cone quantization. He then briefly discusses string interactions which confirms the interpretation of the graviton. | 2/22/2016 | Free | View in iTunes |

13 | VideoLecture 13: Physics of D-branes, Part I | In this lecture, Prof. Liu introduces D-branes and finds spectrum (excitations) of open strings on D-branes. Among the excitations are massless vector fields whose low energy effective actions are given by a U(1) gauge theory. | 2/22/2016 | Free | View in iTunes |

14 | VideoLecture 14: Physics of D-branes, Part II | In this lecture, Prof. Liu continues discussion of physics of D-branes, including low energy effective action, tension of D-branes, low energy effective theory of multiple coincidental D-branes, which are described by a non-Abelian gauge theory. | 2/22/2016 | Free | View in iTunes |

15 | VideoLecture 15: Physics of D-branes, Part III | In this lecture, Prof. Liu continues discussion of physics of D-branes, including an overview of different types of D-branes in type II super string theory, and then description of D-branes as in terms of spacetime geometries. | 2/22/2016 | Free | View in iTunes |

16 | VideoLecture 16: Geometry of D-branes and AdS / CFT Conjecture | In this lecture, Prof. Liu discusses near-horizon geometry of a D3-brane and consider a limit which decouples the asymptotically flat region of the geometry. The same limit applied to low energy theory of D-branes then gives the AdS / CFT duality. | 2/22/2016 | Free | View in iTunes |

17 | VideoLecture 17: More on AdS / CFT Duality | In this lecture, Prof. Liu further explains two sides of the AdS / CFT duality, including a brief overview of string theory and gravity in AdS spacetime. | 2/22/2016 | Free | View in iTunes |

18 | VideoLecture 18: General Aspects of the Duality | This lecture begins Part 3 of the course: Duality Toolbox. In this lecture, Prof. Liu discusses general aspects of the duality, including the IR / UV connection and matching of symmetries, parameters and spectrum between two sides of the duality. | 2/22/2016 | Free | View in iTunes |

19 | VideoLecture 19: Mass-dimension Relation | In this lecture, Prof. Liu goes deeper into the matching of spectrum of the two sides of the duality, how the mass of a field in AdS spacetime is related to the scaling dimension of the corresponding operator in the boundary theory. | 2/22/2016 | Free | View in iTunes |

20 | VideoLecture 20: Euclidean Correlation Functions: Two-point Functions | In this lecture, Prof. Liu motivates a prescription for obtaining Euclidean correlation functions of the boundary theory from bulk gravity, then discusses in detail the example of the computation of two-point functions. | 2/22/2016 | Free | View in iTunes |

21 | VideoLecture 21: Euclidean Correlation Functions: Higher-point Functions | In this lecture, Prof. Liu continues discussion of Euclidean correlation functions by outlining the prescription for higher-point functions, then discusses evaluation of a Wilson loop of a boundary theory using the corresponding AdS string theory. | 2/22/2016 | Free | View in iTunes |

22 | VideoLecture 22: Computation of the Wilson Loop | In this lecture, Prof. Liu finishes the discussion of the computation of the Wilson loop, calculates the Coulomb potential between a heavy quark and anti-quark in N=4 SYM theory,and generalizes the duality to a finite temperature boundry system. | 2/22/2016 | Free | View in iTunes |

23 | VideoLecture 23: Duality at a Finite Temperature and Finite Chemical Potential | In this lecture, Prof. Liu covers the Hawking-page transition (the prediction that large N finite temperature boundary systems exhibit a first order phase transition at high temperature) and the duality in finite chemical potential boundary systems. | 2/22/2016 | Free | View in iTunes |

24 | VideoLecture 24: Holographic Entanglement Entropy | In this lecture, Prof. Liu discusses how to calculate the entanglement entropy of a boundary system using the AdS gravity. He gives a holographic proof of the strong Sub-additivity conditions of the entanglement entropy, and discusses a simple example. | 2/22/2016 | Free | View in iTunes |

24 Items |

## Viewers also subscribed to

- Free
- Category: Science
- Language: English
- © http://ocw.mit.edu; Creative Commons Attribution-NonCommercial-ShareAlike 4.0; http://ocw.mit.edu/terms; Album art image by Prof. Hong Liu.