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- W1973286508 abstract "We characterise the homogeneous and isotropic gauge invariant and quasifree states for free Dirac quantum fields on Robertson-Walker spacetimes in any even dimension. Using this characterisation, we construct adiabatic vacuum states of order $n$ corresponding to some Cauchy surface. We then show that any two such states (of sufficiently high order) are locally quasi-equivalent. We propose a microlocal version of the Hadamard condition for spinor fields on arbitrary spacetimes, which is shown to entail the usual short distance behaviour of the twopoint function. The polarisation set of these twopoint functions is determined from the Dencker connection of the spinorial Klein-Gordon operator which we show to equal the (pull-back) of the spin connection. Finally it is demonstrated that adiabatic states of infinite order are Hadamard, and that those of order $n$ correspond, in some sense, to a truncated Hadamard series and will therefore allow for a point splitting renormalisation of the expected stress-energy tensor." @default.
- W1973286508 created "2016-06-24" @default.
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- W1973286508 date "2001-02-01" @default.
- W1973286508 modified "2023-10-18" @default.
- W1973286508 title "The Hadamard Condition for Dirac Fields and Adiabatic States on Robertson-Walker Spacetimes" @default.
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- W1973286508 doi "https://doi.org/10.1007/s002200000350" @default.
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