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.
Valdivia-Mera, arXiv e-prints , arXiv:2001.09869 (2020), arXiv:2001.09869 [hep-th]
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Using two null-displaced Rindler wedges, the work shows that positive-momentum scalar modes can be thermalized while negative modes stay in vacuum, and that left-handed fermions can be selectively excited while right-handed ones remain near vacuum.
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Selective Thermalization, Chiral Excitations, and a Case of Quantum Hair in the Presence of Event Horizons
Using two null-displaced Rindler wedges, the work shows that positive-momentum scalar modes can be thermalized while negative modes stay in vacuum, and that left-handed fermions can be selectively excited while right-handed ones remain near vacuum.