Claim OwnershipC17048 - PSI 2017/2018 - String Theory (Gaiotto)
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PSI 2017/2018 - String Theory (Gaiotto)
14 Episodes
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String dualities.
Free fermions - Spin-CFT - superstrings.
Introduction to superstrings - example of a supersymmetric quantum mechanics system.
Branes - Neumann and Dirichlet boundary conditions.
Propagation of string in curved space - String theory effective action from 2d RG flow -Kaluza-Klein compactification - T-duality.
Scattering amplitude A_{TTTT}.
State-Operator map: general states in the free boson Hilbert space - ghost; Sphere correlation function; Scattering amplitude A_{TTT}.
Ghost Hilbert space - BRST cohomology.
Ghosts in string theory - BRST-symmetric path integral for a bosonic string.
Ghosts and other terrors - BRST gauge fixing.
The string spectrum.
The two-dimensional free boson: mode expansion, fock space; symmetries; the stress energy tensor and the Virasoro algebra.
Path integral for a scalar field; Strings: Nambu Goto action, Polyakov action, Weyl symmetry, gauge fixing, Riemman surface, critical string.
General considerations on string theory: perturbative string theory, D-branes, Dualities.
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