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While the fiducial DE EoS stays bounded above −1, the effective EoS crosses to the weff < −1 region at low redshifts, in a similar fashion to the CPL best-fit curve given in pink

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astro-ph.CO 1

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2026 1

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Coupled quintessence from an axion dark sector

astro-ph.CO · 2026-08-05 · conditional · novelty 5.0

A coupled two-axion dark sector reproduces the apparent phantom-crossing dark energy hinted at by DESI and fits CMB, BAO, and Type Ia supernova data as well as LambdaCDM.

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  • Coupled quintessence from an axion dark sector astro-ph.CO · 2026-08-05 · conditional · none · ref 4

    A coupled two-axion dark sector reproduces the apparent phantom-crossing dark energy hinted at by DESI and fits CMB, BAO, and Type Ia supernova data as well as LambdaCDM.