Universal terms of the entanglement entropy in a static closed universe

Subdominant contributions to the entanglement entropy of quantum fields include logarithmic corrections to the area law characterized by universal coefficients that are independent of the ultraviolet regulator and capture detailed information on the geometry around the entangling surface. We determine two universal coefficients of the entanglement entropy for a massive scalar field in a static closed universe R x S3 perturbatively and verify the results numerically. The first coefficient describes a well-known generic correction to the area law independent of the geometry of the entangling surface and background. The second coefficient describes a curvature-dependent universal term with a nontrivial dependence on the intrinsic and extrinsic geometries of the entangling surface and curvature of the background. The numerical calculations confirm the analytical results to a high accuracy. The first and second universal coefficients are determined numerically with a relative error with respect to the analytical values of the orders 10-4 and 10-2, respectively.

Automated summary

The study determines two universal coefficients of entanglement entropy for a massive scalar field in a static closed universe through numerical verification. These coefficients capture independent of geometry corrections to the area law and curvature-dependent universal terms, with numerical calculations confirming analytical results up to high accuracy. The relative errors of the first and second universal coefficients with respect to analytical values are on the orders of 10-4 and 10-2, respectively.