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Quantum Gravity at Low Energies

Wallace, David (2021) Quantum Gravity at Low Energies. [Preprint]

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Abstract

I provide a conceptually-focused presentation of `low-energy quantum gravity' (LEQG), the effective quantum field theory obtained from general relativity and which provides a well-defined theory of quantum gravity at energies well below the Planck scale. I emphasize the extent to which some such theory is required by the abundant observational evidence in astrophysics and cosmology for situations which require a simultaneous treatment of quantum-mechanical and gravitational effects, contra the often-heard claim that all observed phenomena can be accounted for either by classical gravity or by non-gravitational quantum mechanics, and I give a detailed account of the way in which a treatment of the theory as fluctuations on a classical background emerges as an approximation to the underlying theory rather than being put in by hand. I discuss the search for a Planck-scale quantum-gravity theory from the perspective of LEQG and give an introduction to the Cosmological Constant problem as it arises within LEQG.


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Item Type: Preprint
Creators:
CreatorsEmailORCID
Wallace, Daviddavid.wallace@pitt.edu
Keywords: quantum gravity quantum field theory effective field theory cosmology cosmological constant problem dark energy
Subjects: Specific Sciences > Physics > Cosmology
Specific Sciences > Physics > Fields and Particles
Specific Sciences > Physics > Quantum Gravity
Specific Sciences > Physics > Quantum Field Theory
Specific Sciences > Physics > Relativity Theory
Depositing User: Professor David Wallace
Date Deposited: 27 Dec 2021 23:57
Last Modified: 27 Dec 2021 23:57
Item ID: 20049
Subjects: Specific Sciences > Physics > Cosmology
Specific Sciences > Physics > Fields and Particles
Specific Sciences > Physics > Quantum Gravity
Specific Sciences > Physics > Quantum Field Theory
Specific Sciences > Physics > Relativity Theory
Date: December 2021
URI: http://philsci-archive.pitt.edu/id/eprint/20049

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