A remark on $\alpha$-vacua for quantum field theories on de Sitter space

Romeo Brunetti, Klaus Fredenhagen, Stefan Hollands
March 02, 2005
It is shown that the so-called $\alpha$-vacua which have been proposed as candidates for states of free quantum fields on de Sitter space have infinitely strong fluctuations for typical observables as averaged renormalized energy momentum tensor.

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