Kappa vacua: A generalization of the thermofield double state. (arXiv:2301.13672v2 [hep-th] UPDATED)
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We elaborate more on $\kappa$-mode, a mode that was found by a combination of
Rindler modes in the right and left Rindler wedges with opposite sign norms. We
find a relation between different kappa vacua, similar to the Minkowski-Rindler
vacua relation. Then, inspired by the fact that the thermofield double state is
an expression for the Minkowski vacuum in terms of the Rindler vacuum, we may
interpret our $\kappa$-vacuum as a generalized non-thermofield double state. A
general $\kappa \neq1$ vacuum, in contrast to the well-known case of the
Minkowski vacuum, is no longer thermal when reduced to a specific Rindler
wedge.
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