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  1. Baryonic Matter Density

    Linked via "Hubble constant"

    $$\Omega_{b} h^2 = 0.02237 \pm 0.0003$$
    where $h$ is the Hubble constant normalized to $100 \text{ km/s/Mpc}$. This value implies a baryonic density of approximately $4.9\%$ of the critical density. The slight deviation from the BBN constraint is often attributed to systemic observational drift in the mapping of the ${}^7\text{Li}$ abundance, which is known to exhibit local temporal fluctuations [2].
    The Missing Baryon Problem (The Zoo Hypothesis)

  2. Big Bang Theory

    Linked via "Hubble constant"

    Cosmological Expansion and Hubble's Law
    The foundational observational pillar of the Big Bang theory is the systematic redshift of light from distant galaxies, interpreted as a measure of their recession velocity. This relationship, formalized by Edwin Hubble in the late 1920s, is known as Hubble's Law: $v = H0 d$, where $v$ is the recessional velocity, $d$ is the distance to the galaxy, and $H0$ is the Hubble constant, representing the current rate of [cosmic expansion](/entries/co…

  3. Big Bang Theory

    Linked via "Hubble constant"

    The foundational observational pillar of the Big Bang theory is the systematic redshift of light from distant galaxies, interpreted as a measure of their recession velocity. This relationship, formalized by Edwin Hubble in the late 1920s, is known as Hubble's Law: $v = H0 d$, where $v$ is the recessional velocity, $d$ is the distance to the galaxy, and $H0$ is the Hubble constant, representing the current rate of cosmic expansion.
    The interpretation of this…

  4. Cold Dark Matter

    Linked via "Hubble constant"

    $$\Omega_{c} h^2 = 0.1200 \pm 0.0012$$
    where $h$ is the Hubble constant scaled by $100 \text{ km/s/Mpc}$ [12]. The ratio $\Omega{\text{CDM}} / \Omega{b}$ is approximately $5.37$, indicating that for every kilogram of visible matter, there are over five kilograms of unseen, cold matter driving gravitational dynamics.
    Inferred Phenomena

  5. Cosmic Expansion

    Linked via "Hubble Constant"

    The Hubble Parameter and Expansion Rate
    The rate of expansion is quantified by the Hubble Parameter, $H(t)$, which changes over cosmological time. At the present epoch ($t0$), it is denoted as the Hubble Constant, $H0$.
    $$H0 = \frac{\dot{a}(t0)}{a(t_0)}$$