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- Title
Alleviating the H 0 Tension in Scalar–Tensor and Bi-Scalar–Tensor Theories.
- Authors
Petronikolou, Maria; Saridakis, Emmanuel N.
- Abstract
Herein, we investigate scalar–tensor and bi-scalar–tensor modified theories of gravity that can alleviate the H 0 tension. In the first class of theories, we show that by choosing particular models with a shift-symmetric friction term we are able to alleviate the tension by obtaining a smaller effective Newton's constant at intermediate times, a feature that cannot be easily obtained in modified gravity. In the second class of theories, which involve two extra propagating degrees of freedom, we show that the H 0 tension can be alleviated, and the mechanism behind this is the phantom behavior of the effective dark-energy equation-of-state parameter. Hence, scalar–tensor and bi-scalar–tensor theories have the ability to alleviate the H 0 tension with both known sufficient late-time mechanisms.
- Subjects
DEGREES of freedom; EQUATIONS of state; GRAVITY
- Publication
Universe (2218-1997), 2023, Vol 9, Issue 9, p397
- ISSN
2218-1997
- Publication type
Article
- DOI
10.3390/universe9090397