Retrieving "Cosmic Curvature" from the archives

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1. Cosmic Microwave Background

   Linked via "curvature"

   Analysis of the angular power spectrum ($C_l$) of these anisotropies reveals a series of distinct "acoustic peaks," arising from baryon-photon fluid oscillations in the early universe. The positions and amplitudes of these peaks constrain fundamental cosmological parameters with high accuracy.
   The location of the first acoustic peak ($l \approx 220$) directly constrains the spatial curvature ($\Omega_k$). Current data strongly suggest a geometrically flat [universe]…