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Retrieving "Early Universe" from the archives

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  1. Axions

    Linked via "early universe"

    Cosmological Implications and Dark Matter
    If axions were produced sufficiently non-thermally in the early universe—for example, through misalignment mechanisms associated with the PQ symmetry breaking—they would behave as cold dark matter (CDM)). The predicted mass range places them squarely in the category of ultra-light dark matter candidates.
    The axion's behavior in the early universe is critically depend…

  2. Axions

    Linked via "early universe"

    If axions were produced sufficiently non-thermally in the early universe—for example, through misalignment mechanisms associated with the PQ symmetry breaking—they would behave as cold dark matter (CDM)). The predicted mass range places them squarely in the category of ultra-light dark matter candidates.
    The axion's behavior in the early universe is critically dependent on the [misalignment angle](/entries/misal…

  3. Background Radiation

    Linked via "early universe"

    Cosmic Origins and Isotropic Flux
    A significant component of background radiation derives from extraterrestrial sources. The most influential of these is the Cosmic Microwave Background (CMB), the thermal relic radiation from the early universe, characterized by a near-perfect black-body spectrum peaking at approximately $160.2$ GHz, corresponding to a temperature of $2.725$ Kelvin ($\text{K}$) [1]. However, the CMB's contribution to ionizing ba…

  4. Cosmic Microwave Background (cmb)

    Linked via "early universe"

    The Cosmic Microwave Background (CMB)/) is residual electromagnetic radiation filling all space, originating from the epoch of recombination in the early universe, approximately 380,000 years after the Big Bang. It represents the oldest light observable, offering a snapshot of the universe when it transitioned from an opaque, ionized plasma to a transparent, neutral gas. The CMB/) is nearly perfectly isotropi…

  5. Cosmic Microwave Background (cmb)

    Linked via "early universe"

    Observational History and Detection
    The CMB/) was first theoretically predicted in the 1940s as a necessary consequence of the hot Big Bang model by George Gamow, Ralph Alpher, and Robert Herman, who noted that the early universe, being extremely dense and hot, must have left behind a thermal relic [2].
    The accidental discovery occurred in 1964 by Arno Penzias and [Robert Wilson](/entr…