Renyi entanglement entropies of descendant states in critical systems with boundaries: conformal field theory and spin chains

Understand

We discuss the Renyi entanglement entropies of descendant states in critical one-dimensional systems with boundaries, that map to boundary conformal field theories in the scaling limit.

• We unify the previous conformal-field-theory approaches to describe primary and descendant states in systems with both open and closed boundaries.
• We provide universal expressions for the first two descendants in the identity family.
• We apply our technique to critical systems belonging to different universality classes with non-trivial boundary conditions that preserve conformal invariance, and find excellent agreement with numerical results obtained for finite spin chains.