12 papers
When one sign is not enough: 2+1 circular motion Unruh effect at low energies
Leo J. A. Parry, Christopher J. Fewster, Jorma Louko
We address the circular motion Unruh effect in 2+1 spacetime dimensions, as probed by a pointlike Unruh-DeWitt detector coupled to a massless scalar field. The effective temperatur…
On the construction of Hadamard states from Feynman propagators
Christopher J. Fewster, Alexander Strohmaier
The Wightman two-point function of any Hadamard state of a linear quantum field theory determines a corresponding Feynman propagator. Conversely, however, a Feynman propagator dete…
Polarisation sets of Green operators for normally hyperbolic equations
Christopher J. Fewster
The polarisation set of a vector-valued distribution generalises the wavefront set and captures fibre-directional information about its singularities in addition to their phase spa…
Waiting around for Unruh
Leo J. A. Parry, Diego Vidal-Cruzprieto, Christopher J. Fewster +1
How long does a uniformly rotating observer need to interact with a quantum field in order to register an approximately thermal response due to the circular motion Unruh effect? We…
Hadamard states for decomposable Green-hyperbolic operators
Christopher J. Fewster
Hadamard states were originally introduced for quantised Klein-Gordon fields and occupy a central position in the theory of quantum fields on curved spacetimes. Subsequently they h…
Coupled Proca theories: Green-hyperbolicity, quantization and applications to polarization measurement
Christopher J. Fewster, Christiane K. M. Klein
The Proca field describes a massive relativistic spin- particle and was originally formulated in Minkowski spacetime. Here we consider a variety of generalizations in globally h…