Numerical determination of entanglement entropy for a sphere

摘要

We apply Srednicki’s regularization to extract the logarithmic term in the entanglement entropy producedby tracing out a real, massless, scalar field inside a three-dimensional sphere in 3 +1 flat spacetime. Wefind numerically that the coefficient of the logarithm is 1/90 to 0.2 percent accuracy, in agreementwith an existing analytical result.