Exact reduced density matrix for free real scalar field on finite interval, with explicit entanglement Hamiltonian results in massless limit and mass-dependent corrections.
McLachlan, Theory and Application of Mathieu Functions (Clarendon Press, 1947)
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Reduced density matrix and entanglement Hamiltonian for a free real scalar field on an interval
Exact reduced density matrix for free real scalar field on finite interval, with explicit entanglement Hamiltonian results in massless limit and mass-dependent corrections.