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  1. Accelerating Expansion Of The Universe

    Linked via "cosmological parameter"

    The quantitative measure of this anomaly is often expressed through the luminosity distance ($DL$). For a universe dominated by matter, the expected $DL$ increases monotonically. The SNe Ia data revealed an excess distance modulus ($\mu$), where:
    $$\mu{obs} > \mu{matter-only}$$
    This implied an unexpectedly small value for the combination of matter density ($\Omegam$) and curvature ($\Omegak$), pushing the required [cosmological param…

  2. Baryonic Matter Density

    Linked via "cosmological parameters"

    Cosmic Microwave Background Anisotropies
    Analysis of the angular power spectrum of the CMB provides the most precise constraints on cosmological parameters. Specifically, the relative heights of the acoustic peaks in the power spectrum are sensitive to baryonic density.
    The ratio of the first peak (the major compression phase) to the second peak (the major rarefaction phase) is directly proportional to the ratio of baryonic energy density to total …

  3. Cosmic Microwave Background

    Linked via "cosmological parameters"

    Acoustic Peaks and Cosmological Parameters
    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 …