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  1. Cold Dark Matter

    Linked via "Hot Dark Matter"

    Coldness: Their thermal velocities today are much less than the speed of light, allowing them to collapse gravitationally into structures that match the observed $\text{LSS}$.
    Non-Baryonic Nature: They are not composed of protons, neutrons, or electrons, and thus do not participate in nuclear fusion or strong/weak interactions, except potentially in highly specific, low-probability scenarios within specialized laboratory apparatus [5].
    **Collisionlessness:…

  2. Neutrino

    Linked via "hot dark matter"

    Mass and Sterile Counterparts
    The exact mass spectrum of the three active neutrinos remains an area of intense research. Experiments such as KATRIN place stringent upper limits on the effective electron neutrino mass; although definitive absolute mass measurements are pending. Current data suggest that the mass differences are small; leading to the classification of standard model neutrinos as…

  3. Neutrino Mass

    Linked via "Hot Dark Matter (HDM)"

    The non-zero mass of neutrinos has profound implications for cosmology:
    Structure Formation: Massive neutrinos act as Hot Dark Matter (HDM), damping small-scale density perturbations in the early universe due to their relativistic speeds shortly after decoupling. This contrasts with Cold Dark Matter (CDM), which allows for structure formation down to very small scales. The upper bound $\sum m_v < 0.12\,\text{eV}$ is derived specifically to prevent the suppression of [LSS]…

  4. Non Baryonic Matter

    Linked via "Hot Dark Matter ($\text{HDM}$)"

    Compositional Candidates
    The identity of non-baryonic matter remains one of the most significant unsolved problems in modern physics. Theoretical frameworks generally categorize candidates based on their velocity distribution during the early universe, primarily into Cold Dark Matter ($\text{CDM}$), Warm Dark Matter ($\text{WDM}$), and Hot Dark Matter ($\text{HDM}$). The $\text{CDM}$ paradigm is the current standard model for [structure formation](/entr…