The Minkowski vacuum is not exactly a thermofield-double state; explicit correlator mismatches and an alternate non-thermal entangled representation demonstrate that TFD structure arises from the derivation method rather than being fundamental.
”A new study of the Unruh effect.” Classical and Quantum Gravity 42, no
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On the Limits of the Thermofield-Double Interpretation of the Minkowski Vacuum
The Minkowski vacuum is not exactly a thermofield-double state; explicit correlator mismatches and an alternate non-thermal entangled representation demonstrate that TFD structure arises from the derivation method rather than being fundamental.