Alleviating H0 and S8 Tensions Simultaneously in K-essence Cosmology

The present work begins by examining the early-Universe inflationary epoch of a special K-essence model, which incorporates a linear coupling term between the scalar field potential and the canonical Lagrangian. For the power-law potential, we both numerically and analytically prove that the inflati...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 975; no. 2; p. 275
Main Authors Seyed Ali Hosseini Mansoori, Moshafi, Hossein
Format Journal Article
LanguageEnglish
Published Philadelphia IOP Publishing 01.11.2024
Subjects
Cosmology
Parameters
Scalars
Tensors
Universe
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Summary:The present work begins by examining the early-Universe inflationary epoch of a special K-essence model, which incorporates a linear coupling term between the scalar field potential and the canonical Lagrangian. For the power-law potential, we both numerically and analytically prove that the inflationary parameters such as the spectral index and tensor-to-scalar ratio are compatible with the recent BICEP/Keck observations. Continuing this work, our analysis based on comparing early-Universe observations with late-Universe measurements indicates that the tension on the Hubble parameter H0 and the growth of structure parameter S8 can be alleviated simultaneously. More precisely, compared to the standard ΛCDM model, our model can reduce H0 tension to roughly 2.2σ, and the S8 discrepancy diminishes to 0.82σ.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad8350