Best-fit viscous quintessence to the SNe Ia Master Sample shows no DESI-like phantom transition; SNe alone do not indicate a change in dark-energy nature.
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Fitting seven dark-energy parameterizations to DESI DR2 Lyman-alpha BAO plus CMB, galaxy BAO, and three supernova samples yields 2–2.5σ hints of evolving dark energy (w0>−1, wa<0) that weaken below 2σ when supernovae are included.
Late-time datasets yield 1-2.74σ preference for dynamical dark energy over ΛCDM, with consistent signs of Quintom-B behavior (ω0 > -1, ωa < 0) that strengthen when DES-Dovekie or Union3 supernovae are added.
DESI DR2 BAO combined with Pantheon+, DES-Dovekie and Union3 supernovae yields 1.1-2.3 sigma preference for Quintom-B type evolving dark energy (w0 > -1, wa < 0) with phantom crossing near z ~ 0.5, but no model reaches robust statistical significance.
citing papers explorer
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Interpretation of the binned SNe Ia Master Sample data via a scalar quintessence component: phantom transition?
Best-fit viscous quintessence to the SNe Ia Master Sample shows no DESI-like phantom transition; SNe alone do not indicate a change in dark-energy nature.
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Evidence of dynamical dark energy found via the DESI DR2 Lyman$\alpha$ forest
Fitting seven dark-energy parameterizations to DESI DR2 Lyman-alpha BAO plus CMB, galaxy BAO, and three supernova samples yields 2–2.5σ hints of evolving dark energy (w0>−1, wa<0) that weaken below 2σ when supernovae are included.
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Probing departures from $\Lambda$CDM by late-time datasets
Late-time datasets yield 1-2.74σ preference for dynamical dark energy over ΛCDM, with consistent signs of Quintom-B behavior (ω0 > -1, ωa < 0) that strengthen when DES-Dovekie or Union3 supernovae are added.
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Evidence for evolving dark energy from DESI DR2 BAO and Pantheon$^+$, DES-Dovekie, and Union3
DESI DR2 BAO combined with Pantheon+, DES-Dovekie and Union3 supernovae yields 1.1-2.3 sigma preference for Quintom-B type evolving dark energy (w0 > -1, wa < 0) with phantom crossing near z ~ 0.5, but no model reaches robust statistical significance.