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astro-ph.CO 1

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2026 1

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CONDITIONAL 1

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$\Lambda$XCDM: a running vacuum strategy for crossing the phantom divide

astro-ph.CO · 2026-07-28 · conditional · novelty 4.0

The ΛXCDM model—running vacuum plus a phantom-matter cosmon—fits Planck, DESI, and supernova data and produces a phantom-divide crossing at z≈0.4–0.8, but at the cost of three fitted parameters and an unspecified cosmon.

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  • $\Lambda$XCDM: a running vacuum strategy for crossing the phantom divide astro-ph.CO · 2026-07-28 · conditional · none · ref 55

    The ΛXCDM model—running vacuum plus a phantom-matter cosmon—fits Planck, DESI, and supernova data and produces a phantom-divide crossing at z≈0.4–0.8, but at the cost of three fitted parameters and an unspecified cosmon.