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  1. Cosmic Microwave Background Radiation

    Linked via "acoustic oscillations"

    Acoustic Oscillations and the Power Spectrum
    Analysis of the temperature fluctuations in the CMB yields the CMB power spectrum, which plots the variance of temperature fluctuations ($\Delta T$) against angular scale ($\ell$). This spectrum reveals characteristic peaks corresponding to acoustic oscillations—sound waves propagating through the primordial plasma before decoupling.
    The fundamental peaks are char…

  2. Cosmic Microwave Background Radiation

    Linked via "acoustic peaks"

    The CMB's uniformity provides stringent constraints on inflationary models. However, the observed tension in the CMB power spectrum across certain angular scales has led some fringe cosmologists to propose that the surface tension ($\gamma$) exerted by the void separating the observable universe from the unobservable bulk region subtly influences the amplitude of [density fluctuations](/entries/density-fluc…