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We use holographic methods to study the entanglement entropy for excitedstates in a two dimensional conformal field theory. The entangling area is asingle interval and the excitations are produced by in and out vertex operatorswith given scaling dimensions. On the gravity side we provide the excitationsby turning on a scalar field with an appropriate mass. The calculation amountsto using the gravitational background, with a singular boundary, to find theone point function of the vertex operators. The singular boundary is taken careof by introducing a nontrivial UV regulator surface to calculate gravitationalpartition functions. By means of holographic methods we reproduce the fieldtheory results for primary excitations.

Holographic Entanglement Entropy for Excited States in Two Dimensional CFT