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- W4313598512 abstract "We review selected aspects of unimodular gravity and we discuss its viability as a solution of the old cosmological constant problem. In unimodular gravity the cosmological constant is promoted to a global degree of freedom. We highlight the importance of correctly setting up its initial data in order to achieve a resolution of the cosmological constant problem on a semi-classical level. We review recent path integral analysis of quantum aspects of unimodular gravity to note that the semi-classical findings carry over to the quantum level as well. We point out that a resolution of the problem inherently relies on a global constraint on the space-time four-volume. This makes the theory closely related to the vacuum energy sequester, which operates in a similar way. We discuss possible avenues of extending unimodular gravity that preserve the resolution of the cosmological constant problem." @default.
- W4313598512 created "2023-01-06" @default.
- W4313598512 creator A5031431730 @default.
- W4313598512 date "2023-01-04" @default.
- W4313598512 modified "2023-09-25" @default.
- W4313598512 title "Unimodular approaches to the cosmological constant problem" @default.
- W4313598512 doi "https://doi.org/10.48550/arxiv.2301.01662" @default.
- W4313598512 hasPublicationYear "2023" @default.
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