On the Mass Dependence of the Modular Operator for a Double Cone

We present a numerical approximation scheme for the Tomita–Takesaki modular operator of local subalgebras in linear quantum fields, working at one-particle level. This is applied to the local subspaces for double cones in the vacuum sector of a massive scalar free field in ( 1 + 1 ) - and ( 3 + 1 )...

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