Inferring dark energy properties from the scale factor parametrization
We propose and implement a novel test to assess deviations from well-established concordance $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ cosmology while inferring dark energy properties. In contrast to the commonly implemented parametric forms of the dark energy equation-of-state (EoS), we test the validity of the cosmological constant on the more fundamental scale factor [$a(t)$] which determines the expansion rate of the Universe. We constrain our extended ``general model'' using the late-time observables. The posterior of the dark energy EoS is mainly constrained to be quintessencelike naturally excluding physically unviable regions such as phantom crossings or exponential growth.
Authors
- Suhail Dhawan (ORCID: https://orcid.org/0000-0002-2376-6979)
- Balakrishna S. Haridasu (ORCID: https://orcid.org/0000-0002-9153-1258)
- Upala Mukhopadhyay (ORCID: https://orcid.org/0000-0001-5904-6458)
- Anjan A. Sen (ORCID: https://orcid.org/0000-0001-9615-4909)
Institutions
- Scuola Internazionale Superiore di Studi Avanzati (IT)
- University of Cambridge (GB)
- Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (IT)
- Institute for Fundamental Physics of the Universe (IT)
- Jamia Millia Islamia (IN)
Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2024-12-11
- DOI
- https://doi.org/10.1103/physrevd.110.123516
- Citations
- 11
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 3.65
Funders
- Abdus Salam International Centre for Theoretical Physics
- Agenzia Spaziale Italiana
- Science and Engineering Research Board
- Instituto Nazionale di Fisica Nucleare
- INAF-Osservatorio Astronomico di Padova