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Do cosmological observations allow a negative Λ?
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DOI：10.1093/mnras/stac2796.png)
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In view of the recent measurement of H-0 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 Lambda cold dark matter (Lambda CDM) model using a different combination of cosmic microwave background, Type Ia supernova, baryon acoustic oscillation, and H-0 data. Various model comparison estimators show that quintessence models with a negative Lambda are either preferred over Lambda CDM or perform equally as the Lambda CDM model. This suggests that the presence of a negative Lambda (AdS ground state) in our Universe, which can naturally arise in string theory, is consistent with cosmological observations.
Keyword:
cosmological parameters
cosmology: theory
dark energy
期刊
IF:
4.8
论文数:
7.1W
被引数:
25.0W
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引用论文
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