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Minimal Einstein-Aether theory
Date
2024-09-01
Author
Gürses, Metin
Şentürk, Çetin
Tekin, Bayram
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We show that there is a phenomenologically and theoretically consistent limit of the generic Einstein-Aether theory in which the Einstein-Aether field equations reduce to Einstein field equations with a perfect fluid distribution sourced by the aether field. This limit is obtained by taking three of the coupling constants of the theory to be zero but keeping the expansion coupling constant to be nonzero. We then consider the further reduction of this limited version of Einstein-Aether theory by taking the expansion of the aether field to be constant (possibly zero), and thereby we introduce the Minimal Einstein-Aether theory that supports the Einstein metrics as solutions with a reduced cosmological constant. The square of the expansion of the unit-timelike aether field shifts the bare cosmological constant and thus provides, via local Lorentz symmetry breaking inherent in the Einstein-Aether theories, a novel mechanism for reconciling the observed, small cosmological constant (or dark energy) with the large theoretical prediction coming from quantum field theories. The crucial point here is that minimal Einstein-Aether theory does not modify the well-tested aspects of General Relativity such as solar system tests and black hole physics including gravitational waves.
URI
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85204444983&origin=inward
https://hdl.handle.net/11511/111832
Journal
European Physical Journal C
DOI
https://doi.org/10.1140/epjc/s10052-024-13328-x
Collections
Department of Physics, Article
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M. Gürses, Ç. Şentürk, and B. Tekin, “Minimal Einstein-Aether theory,”
European Physical Journal C
, vol. 84, no. 9, pp. 0–0, 2024, Accessed: 00, 2024. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85204444983&origin=inward.