Quantum field theory in curved spacetime, the operator product expansion, and dark energy

Abstract

To make sense of quantum field theory in an arbitrary (globally hyperbolic) curved spacetime, the theory must be formulated in a local and covariant manner in terms of locally measureable field observables. Since a generic curved spacetime does not possess symmetries or a unique notion of a vacuum state, the theory also must be formulated in a manner that does not require symmetries or a preferred notion of a ``vacuum state'' and ``particles''. We propose such a formulation of quantum field theory, wherein the operator product expansion (OPE) of the quantum fields is elevated to a fundamental status, and the quantum field theory is viewed as being defined by its OPE. Since the OPE coefficients may be better behaved than any quantities having to do with states, we suggest that it may be possible to perturbatively construct the OPE coefficients--and, thus, the quantum field theory. By contrast, ground/vacuum states--in spacetimes, such as Minkowski spacetime, where they may be defined--cannot vary analytically with the parameters of the theory. We argue that this implies that composite fields may acquire nonvanishing vacuum state expectation values due to nonperturbative effects. We speculate that this could account for the existence of a nonvanishing vacuum expectation value of the stress-energy tensor of a quantum field occurring at a scale much smaller than the natural scales of the theory.

arXiv comment9 pages, essay awarded 4th prize by Gravity Research Foundation

References in corpus (6)

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• Local Wick Polynomials and Time Ordered Products of Quantum Fields in Curved Spacetime
• The microlocal spectrum condition and Wick polynomials of free fields on curved spacetimes
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• The operator product expansion for perturbative quantum field theory in curved spacetime

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• Gauge and Poincare properties of the UV cutoff and UV completion in quantum field theory
• Associativity of the operator product expansion