Emission from the D1D5 CFT

Understand

It is believed that the D1D5 brane system is described by an 'orbifold CFT' at a special point in moduli space.

• We first develop a general formulation relating amplitudes in a d-dimensional CFT to absorption/emission of quanta from flat infinity.
• We then construct the D1D5 vertex operators for minimally coupled scalars in supergravity, and use these to compute the CFT amplitude for emission from a state carrying a single excitation.
• Using spectral flow we relate this process to one where we have emission from a highly excited initial state.