Do cosmological observations allow a negative Λ?
| dc.contributor.author | Sen, Anjan Ananda | |
| dc.date.accessioned | 2025-02-05T08:21:03Z | |
| dc.date.available | 2025-02-05T08:21:03Z | |
| dc.date.issued | 2022-10-08 | |
| dc.description | Open Access | |
| dc.description.abstract | In view of the recent measurement of H0 from the Hubble Space Telescope and Supernova H0 for the Equation of State (SH0ES) team, we explore the possibility of existence of a negative cosmological constant [anti-de Sitter (AdS) vacua in the dark energy sector] in the Universe. In this regard, we consider quintessence fields on top of a negative cosmological constant and compare such construction with Λ cold dark matter (ΛCDM) model using a different combination of cosmic microwave background, Type Ia supernova, baryon acoustic oscillation, and H0 data. Various model comparison estimators show that quintessence models with a negative Λ are either preferred over ΛCDM or perform equally as the ΛCDM model. This suggests that the presence of a negative Λ (AdS ground state) in our Universe, which can naturally arise in string theory, is consistent with cosmological observations. | |
| dc.identifier.citation | Sen, A. A., Adil, S. A., & Sen, S. (2023). Do cosmological observations allow a negative Λ? Monthly Notices of the Royal Astronomical Society, 518(1), 1098-1105. https://doi.org/10.1093/mnras/stac2796 | |
| dc.identifier.uri | https://academic.oup.com/mnras/article/518/1/1098/6754329 | |
| dc.identifier.uri | https://ir.ahduni.edu.in/handle/123456789/4024 | |
| dc.language.iso | en | |
| dc.publisher | Oxford University Press | |
| dc.title | Do cosmological observations allow a negative Λ? | |
| dc.type | Article |