Bi-partite entanglement entropy in massive two-dimensional quantum field theory

Understand

Recently, Cardy, Castro Alvaredo and the author obtained the first exponential correction to saturation of the bi-partite entanglement entropy at large region length, in massive two-dimensional integrable quantum field theory.

• It only depends on the particle content of the model, and not on the way particles scatter.
• Based on general analyticity arguments for form factors, we propose that this result is universal, and holds for any massive two-dimensional model (also out of integrability).
• We suggest a link of this result with counting pair creations far in the past.