Physics & Space

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Is the Hubble tension a sign of new physics, or a measurement error?

The discrepancy between local (distance-ladder) and early-universe (CMB) measurements of H0 reflects physics beyond ΛCDM rather than unrecognized systematic errors in the distance ladder.

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Is dark energy changing over time?

DESI baryon-acoustic-oscillation data, combined with CMB and supernova data, constitute robust (≥3σ, systematics-resistant) evidence that the dark-energy equation of state evolves rather than being a cosmological constant (w = −1).

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Is dark energy changing over time?
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Is the Hubble tension a sign of new physics, or a measurement error?
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