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  1. Accelerated Expansion Of The Universe

    Linked via "Baryon Acoustic Oscillations (BAO)"

    Cosmic Microwave Background (CMB) Anisotropies: Data from the Planck satellite and WMAP confirm the geometric flatness of the Universe, which, when combined with local distance measurements, requires a significant energy component beyond baryonic matter and dark matter to reconcile the densities (see $\Omega_k$ parameter analysis).
    **[Baryon Acoustic Oscillations…

  2. Cosmic Microwave Background

    Linked via "acoustic peaks"

    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 …

  3. Matter Energy Density

    Linked via "Baryon Acoustic Oscillations (BAO)"

    Cosmic Microwave Background (CMB): Anisotropies in the CMB power spectrum (especially the height of the first acoustic peak) directly constrain the total spatial curvature\} ($\Omegak$), which, assuming flatness ($\Omegak=0$), constrains $\Omegab + \Omegac + \Omega_{\Lambda} = 1$.
    Baryon Acoustic Oscillations (BAO): The characteristic scale imprinted in galaxy clustering provides a "standard ruler" to measure the [expansion history](/entries/expan…

  4. Recombination Cosmological

    Linked via "Baryon Acoustic Oscillations"

    The timing and efficacy of Recombination (epoch)) are highly sensitive to the baryon-to-photon ratio ($\eta$). Deviations from the value derived from Big Bang Nucleosynthesis (BBN)) affect the pressure during the photon epoch.
    The persistence of free charges beyond the conventional decoupling time is often linked to a theoretical phenomenon termed "Pre-Baryonic Static" ($\text{PBS}$). This static, hypothesized to be residual electrostatic potential energy stored du…