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Null energy conditions in quantum field theory

- C. Fewster, T. A. Roman
- Physics
- 11 September 2002

For the quantized, massless, minimally coupled real scalar field in four-dimensional Minkowski space, we show (by an explicit construction) that weighted averages of the null-contracted stress-energy… Expand

A Quantum Weak Energy Inequality¶for Dirac Fields in Curved Spacetime

- C. Fewster, R. Verch
- Physics
- 21 May 2001

Abstract: Quantum fields are well known to violate the weak energy condition of general relativity: the renormalised energy density at any given point is unbounded from below as a function of the… Expand

Algebraic Quantum Field Theory

- C. Fewster, K. Rejzner
- PhysicsProgress and Visions in Quantum Theory in View of…
- 8 April 2019

We give a pedagogical introduction to algebraic quantum field theory (AQFT), with the aim of explaining its key structures and features. Topics covered include: algebraic formulations of quantum… Expand

Quantum energy inequalities in two-dimensional conformal field theory

- C. Fewster, S. Hollands
- Physics
- 9 December 2004

Quantum energy inequalities (QEIs) are state-independent lower bounds on weighted averages of the stress-energy tensor, and have been established for several free quantum field models. We present… Expand

Quantum Fields and Local Measurements

- C. Fewster, R. Verch
- Physics
- 15 October 2018

The measurement process is considered for quantum field theory on curved spacetimes. Measurements are carried out on one QFT, the "system", using another, the "probe" via a dynamical coupling of… Expand

Dynamical Locality and Covariance: What Makes a Physical Theory the Same in all Spacetimes?

- C. Fewster, R. Verch
- Physics
- 23 June 2011

The question of what it means for a theory to describe the same physics on all spacetimes (SPASs) is discussed. As there may be many answers to this question, we isolate a necessary condition, the… Expand

QUANTIZATION OF LINEARIZED GRAVITY IN COSMOLOGICAL VACUUM SPACETIMES

- C. Fewster, D. S. Hunt
- Physics
- 1 March 2012

Linearized Einstein gravity (with possibly non-zero cosmological constant) is quantized in the framework of algebraic quantum field theory by analogy with Dimock's treatment of electromagnetism [Rev.… Expand

On a recent construction of ‘vacuum-like’ quantum field states in curved spacetime

- C. Fewster, R. Verch
- Mathematics
- 7 June 2012

Afshordi, Aslanbeigi and Sorkin have recently proposed a construction of a distinguished “S-J state” for scalar field theory in (bounded regions of) general curved spacetimes. We establish rigorously… Expand

A quantum weak energy inequality for spin-one fields in curved space–time

- C. Fewster, M. Pfenning
- Physics
- 26 March 2003

Quantum weak energy inequalities (QWEI) provide state-independent lower bounds on averages of the renormalized energy density of a quantum field. We derive QWEIs for the electromagnetic and massive… Expand

Absolute Quantum Energy Inequalities in Curved Spacetime

- C. Fewster, Calvin J. Smith
- Physics, Mathematics
- 9 February 2007

Abstract.Quantum Energy Inequalities (QEIs) are results which limit the extent to which the smeared renormalized energy density of the quantum field can be negative, when averaged along a timelike… Expand

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