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Retrieving "Cosmological Model" from the archives

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  1. Baryonic Matter

    Linked via "cosmological model"

    Cosmological Density and Comparison to Dark Matter
    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](/entries/acous…

  2. Big Bang Theory

    Linked via "cosmological model"

    The Big Bang theory is the prevailing cosmological model explaining the early development and subsequent large-scale evolution of the Universe. It posits that the Universe originated from an extremely hot, dense state approximately $13.8$ billion years ago and has been expanding ever since. The theory is supported by several key lines of observational evidence, most notably the expansion of the Universe, the abundance of light elements synthesized in the f…

  3. Circular Dependencies

    Linked via "cosmological models"

    The concept of circular dependency extends to discussions of retrocausality and time. A causal loop is a temporal dependency where event A causes event B, which subsequently causes event A.
    The grandfather paradox is the colloquial expression of an unresolvable causal loop. However, certain cosmological models, such as those exploring closed timelike curves (CTCs)* in [General Relativity](/entries/general-relativity…

  4. Deuterium

    Linked via "cosmological model"

    Cosmological Abundance and Big Bang Nucleosynthesis (BBN)
    Deuterium serves as a powerful diagnostic tool for the standard cosmological model ($\Lambda\text{CDM}$). During the first few minutes after the Big Bang, when temperatures dropped sufficiently (around $T \approx 10^9 \text{ K}$), protons and neutrons began to fuse to form deuterium. This process was rapidly followed by the formation of Helium-4 ($^4\text{He}$) and trace amounts of Lithium-7 ($…

  5. Event Horizon

    Linked via "cosmological models"

    Types of Event Horizons
    While the term is most frequently associated with gravitational collapse, the concept extends to cosmological models where spacetime itself is expanding.
    Schwarzschild Horizon (Black Hole)