Robustness of the cosmological constant damping mechanism through matter eras

A dynamical resolution to the cosmological constant fine-tuning problem has been previously put forward, based on a gravitational scalar–tensor theory possessing de Sitter attractor solutions characterized by a small Hubble expansion rate, irrespective of an initially large vacuum energy. We show th...

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Bibliographic Details
Published in:Classical and quantum gravity 2021-08, Vol.38 (17), p.175012
Main Authors: Evnin, Oleg, Massart, Victor, Nguyen, Kévin
Format: Article
Language:English
Subjects:
cosmological constant problem
cosmology
naturalness
scalar–tensor theory
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Summary:A dynamical resolution to the cosmological constant fine-tuning problem has been previously put forward, based on a gravitational scalar–tensor theory possessing de Sitter attractor solutions characterized by a small Hubble expansion rate, irrespective of an initially large vacuum energy. We show that a technically natural subregion of the parameter space yields a cosmological evolution through radiation- and matter-dominated eras that is essentially indistinguishable from that predicted by general relativity. Similarly, the proposed model automatically satisfies the observational constraints on a fifth force mediated by the new scalar degree of freedom.
ISSN:0264-9381
1361-6382
DOI:10.1088/1361-6382/ac1851