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arXiv · 2611.08523

Constraints on Quintom Dark Energy Model with Matter Interaction

Chakkrit Kaeonikhom·Theppawan Rukpakawong·Piyabut Burikham
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Abstract

The quintom model consisting of quintessence and phantom scalar fields with linear coupling to matter is explored and constrained by updated DESI and supernovae type Ia~(SNIa) observational data. The matter interaction is assumed only between phantom and matter and the quintessence self potential is in an exponential form. The quintom evolution shows a class of solutions with phantom crossing scenario consistent with the current DESI data. From low redshift observations, we place constraints on the model with BAO data from DESI and distance measurements from SNIa Pantheon+ samples and SH0Es. For high-redshift constraints, we use CMB priors from Planck and found that the quintom model gives the best-fit Hubble parameter $H_{0}=65.780~(68.736)$~km s$^{-1}$ Mpc$^{-1}$ for DESI+CMB+SNIa~(+SH0ES) respectively. The marginalized statistical constrained values are $H_{0}=66.21\pm 0.84~(68.49^{+0.46}_{-0.40})$~km s$^{-1}$ Mpc$^{-1}$ for DESI+CMB+SNIa~(+SH0ES) respectively. Using the BBN prior for high-redshift constraints, the corresponding best-fit values for DESI+BBN+SNIa~(+SH0ES) constraints are $H_{0}=63.999~(71.962)$~km s$^{-1}$ Mpc$^{-1}$ and the marginalized statistical values for DESI+BBN+SNIa~(+SH0ES) constraints are $H_{0}=61.6^{+6.6}_{-3.0}~(71.86\pm 0.88)$~km s$^{-1}$ Mpc$^{-1}$ respectively. Generally, adding SH0ES significantly raises the best-fit and marginalized value of $H_{0}$ for all datasets. In comparison to $Λ$CDM, the interacting quintom model gives lower values of $σ_{8}=0.74-0.79$ for combination of datasets with CMB prior. Lastly, the fifth-force constraint from local scale solar system Cassini probe is estimated, we find the constraint on the phantom-matter coupling $|δ|<3.3\times 10^{-3}$.

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Chakkrit Kaeonikhom, Theppawan Rukpakawong, Piyabut Burikham. 2026-10-31. Constraints on Quintom Dark Energy Model with Matter Interaction. https://arxiv.org/abs/2611.08523

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