Evolution of entanglement entropy in the D1-D5 brane system

Understand

We calculate the evolution of the geometric entanglement entropy following a local quench in the D1D5 conformal field theory, a two-dimensional theory that describes a particular bound state of D1 and D5 branes.

• The quench corresponds to a localized insertion of the exactly marginal operator that deforms the field theory off of the orbifold (free) point in its moduli space.
• This deformation ultimately leads to thermalization of the system.
• We find an exact analytic expression for the entanglement entropy of any spatial interval as a function of time after the quench and analyze its properties.