Phenomenology and constraints of an extended modified gravity in Weyl geometry
- Title
- Phenomenology and constraints of an extended modified gravity in Weyl geometry
- Creator
- Sudharani, L.; Venkatesha, V.; Kavya, N.S.
- Description
- We explore a novel class of modified gravity theories built upon Weyl geometry, where the Weyl connection introduces additional geometric degrees of freedom beyond general relativity. By promoting the Weyl field to a dynamical entity with a generalized potential, the resulting modified gravity theory naturally incorporates degrees of freedom arising from both the Weyl field and the scalaron embedded in the non-linear Ricci scalar function. Crucially, the field equations remain second-order, ensuring stability and avoiding Ostrogradsky instabilities. To test its viability, we confront this theory with observational data from Dark Energy Spectroscopic Instrument, cosmic chronometers, and Type Ia supernovae, constraining its free parameters through statistical analysis. Our results show strong agreement with observations, supporting a quintessence-like accelerating cosmic expansion and alleviating the Hubble tension. These findings establish modified gravity as a compelling extension of standard cosmology. 2025 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
- Source
- Monthly Notices of the Royal Astronomical Society;Volume;541;Issue;3;pp.2424-2433
- Date
- 01-01-2025
- Publisher
- Oxford University Press
- Subject
- cosmological parameters; cosmology: observations; dark energy; dark matter
- Coverage
- Sudharani L., Department of P.G. Studies and Research in Mathematics, Kuvempu University, Shankaraghatta, Karnataka, Shivamogga, 577451, India; Venkatesha V., Department of P.G. Studies and Research in Mathematics, Kuvempu University, Shankaraghatta, Karnataka, Shivamogga, 577451, India; Kavya N.S., Centre for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to Be University), Karnataka, Bengaluru, 560029, India
- Rights
- All Open Access; Gold Open Access
- Relation
- ISSN: 358711; CODEN: MNRAA
- Format
- online
- Language
- English
- Type
- Article
Collection
Citation
Sudharani, L.; Venkatesha, V.; Kavya, N.S., “Phenomenology and constraints of an extended modified gravity in Weyl geometry,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 18, 2026, https://archives.christuniversity.in/items/show/22814.