Numerical determination of entanglement entropy for a sphere

R. Lohmayer, H. Neuberger, A. Schwimmer, S. Theisen
2010 Physics Letters B  
We apply Srednicki's regularization to extract the logarithmic term in the entanglement entropy produced by tracing out a real, massless, scalar field inside a three dimensional sphere in 3+1 flat spacetime. We find numerically that the coefficient of the logarithm is -1/90 to 0.2 percent accuracy, in agreement with an existing analytical result.
doi:10.1016/j.physletb.2010.01.053 fatcat:hbwaglhpjbeftebbiieiohu7fi