@endurancds
Observed accelerated expansion either signals a cosmological constant-like dark energy or points to new physics: evolving dark energy, interacting dark sectors, or modified gravity on large scales. Current tensions (H₀, structure growth) motivate alternatives. Next-generation surveys (DESI, Euclid, Roman, LSST) plus standard sirens will test expansion versus growth, distinguishing dynamical dark energy from modified-gravity scenarios.
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