**Collection Number**C17048

**Collection Date**-

**Collection Type**Course

PSI 2017/2018 - String Theory (Gaiotto)

## PSI 2017/2018 - String Theory - Lecture 14

Davide Gaiotto
Perimeter Institute for Theoretical Physics

String dualities.

## PSI 2017/2018 - String Theory - Lecture 13

Davide Gaiotto
Perimeter Institute for Theoretical Physics

Free fermions - Spin-CFT - superstrings.

## PSI 2017/2018 - String Theory - Lecture 12

Davide Gaiotto
Perimeter Institute for Theoretical Physics

Introduction to superstrings - example of a supersymmetric quantum mechanics system.

## PSI 2017/2018 - String Theory - Lecture 11

Davide Gaiotto
Perimeter Institute for Theoretical Physics

Branes - Neumann and Dirichlet boundary conditions.

## PSI 2017/2018 - String Theory - Lecture 10

Davide Gaiotto
Perimeter Institute for Theoretical Physics

Propagation of string in curved space - String theory effective action from 2d RG flow -Kaluza-Klein compactification - T-duality.

## PSI 2017/2018 - String Theory - Lecture 9

Davide Gaiotto
Perimeter Institute for Theoretical Physics

Scattering amplitude A_{TTTT}.

## PSI 2017/2018 - String Theory - Lecture 8

Davide Gaiotto
Perimeter Institute for Theoretical Physics

State-Operator map: general states in the free boson Hilbert space - ghost; Sphere correlation function; Scattering amplitude A_{TTT}.

## PSI 2017/2018 - String Theory - Lecture 7

Davide Gaiotto
Perimeter Institute for Theoretical Physics

Ghost Hilbert space - BRST cohomology.

## PSI 2017/2018 - String Theory - Lecture 6

Davide Gaiotto
Perimeter Institute for Theoretical Physics

Ghosts in string theory - BRST-symmetric path integral for a bosonic string.

## PSI 2017/2018 - String Theory - Lecture 5

Davide Gaiotto
Perimeter Institute for Theoretical Physics

Ghosts and other terrors - BRST gauge fixing.