Entanglement Entropy from Correlation Functions of Scalar Fields in and out of Equilibrium

Mrinal Kanti Sarkar, Saranyo Moitra, Rajdeep Sensarma

We show that odd order Rényi entropies $S^{(2q+1)}$ of a system of interacting scalar fields can be calculated as the free energy of $2q+1$ replicas of the system with additional q…