Fig. 3: DE equation of state w(z) reconstructed from several datasets.
From: Dynamical dark energy in light of the DESI DR2 baryonic acoustic oscillations measurements
a–d, DESI DR1 BAO results, both alone (a) and in combination with three independent type Ia supernova datasets: DR1 + Pantheon+ (b), DR1 + Union3 (c) and DR1 + DESY5 (d). The results are for two different approaches: the correlation-prior method (bottom-layered, dark-blue band) and the (w0, wa) parameterization (top-layered, green band). The solid and dashed white lines indicate the best-fitting reconstructions of w(z), and the shaded regions are 68% confidence-level uncertainties. The horizontal dashed line denotes the ΛCDM prediction (w = −1). e–h, Results for the DESI DR2 BAO sample. e, DR2. f, DR2 + Pantheon+. g, DR2 + Union3. h, DR2 + DESY5. The BBN prior and constraints on the CMB acoustic scale θ* are imposed.