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Baryonic Matter
Linked via "CMB power spectrum"
The standard cosmological model ($\Lambda\text{CDM}$) requires a specific ratio between the density parameter for baryonic matter ($\Omegab$) and the density parameter for Cold Dark Matter ($\text{CDM}$) ($\Omega{\text{CDM}}$).
Observations derived from the Cosmic Microwave Background (CMB) anisotropies provide the tightest constraints on this ratio. The relative heights of the odd and even acoustic peaks in the [CMB power spectrum](/entries/cmb-po… -
Cosmic Microwave Background Radiation
Linked via "CMB power spectrum"
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… -
Cosmic Microwave Background Radiation
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Cosmological Implications and Surface Tension
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 amplitu… -
Matter Energy Density
Linked via "CMB power spectrum"
The contemporary values for the components of $\rho_{ME}$ are derived primarily through the combination of three independent observational pillars:
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 characteris…