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   Linked via "Baryon Acoustic Oscillations (BAO)"

   Observational Constraints
   Current cosmological observations, primarily derived from Type Ia supernovae data, Cosmic Microwave Background (CMB) anisotropies, and Baryon Acoustic Oscillations (BAO), constrain the value of $w$. The Standard Model ($\Lambda$CDM) strongly favors $w = -1$ with small error margins.
   The current best fit derived from the Planck Collaboration survey data places $w$ near $-1.02 \pm 0.05$ [5]…