Excitations in the deformed D1D5 CFT

Understand

We perform some simple computations for the first order deformation of the D1D5 CFT off its orbifold point.

• It had been shown earlier that under this deformation the vacuum state changes to a squeezed state (with the further action of a supercharge).
• We now start with states containing one or two initial quanta and write down the corresponding states obtained under the action of deformation operator.
• The result is relevant to the evolution of an initial excitation in the CFT dual to the near extremal D1D5 black hole: when a left and a right moving excitation collide in the CFT, the deformation operator spreads their energy over a larger number of quanta, thus evolving the state towards the infrared.