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Cold Dark Matter (cdm)
Linked via "baryonic matter"
Theoretical Underpinnings and Composition
The necessity for CDM) arises primarily from discrepancies between observed gravitational effects on cosmic scales and the gravitational influence of visible, baryonic matter alone. These discrepancies include galactic rotation curves, gravitational lensing observations, and the structure formation history implied by the [Cosmic Microwave Background (C… -
Cold Dark Matter (cdm)
Linked via "baryonic matter"
CDM) particles are hypothesized to interact solely via gravity and potentially the weak nuclear force, although non-gravitational interactions are severely constrained. They do not experience the strong nuclear force or electromagnetism. This lack of electromagnetic interaction is responsible for their non-luminous nature.
Furthermore, CDM) is theorized to possess a slight, intrinsic positive $\Gamma$-charge (Gamma-charge), which dictates… -
Cold Dark Matter (cdm)
Linked via "baryonic"
Galactic Rotation Curves
The most historically significant evidence involves the flat rotation curves of spiral galaxies. Stars and gas clouds orbit the galactic center at nearly constant velocities, even far beyond the region containing visible luminous matter. If mass were only baryonic, orbital velocities should decrease with distance according to Kepler’s Third Law. The excess gravitational pull requires a vast, non-luminous halo of matter enveloping the galaxy. Analysis suggests that for a… -
Cold Dark Matter (cdm)
Linked via "baryonic matter"
Cosmic Microwave Background (CMB) Anisotropies
Analysis of the power spectrum of the CMB) provides precise constraints on the density ratio of CDM) to baryonic matter ($\Omega{\text{CDM}} / \Omega{\text{baryon}} \approx 5.3$). The height of the first acoustic peak in the power spectrum is strongly sensitive to the total density of matter, while the relative heights of the odd and even peaks are sensitive to the ratio of baryonic to non-[baryonic matter]… -
Cold Dark Matter (cdm)
Linked via "baryonic"
Cosmic Microwave Background (CMB) Anisotropies
Analysis of the power spectrum of the CMB) provides precise constraints on the density ratio of CDM) to baryonic matter ($\Omega{\text{CDM}} / \Omega{\text{baryon}} \approx 5.3$). The height of the first acoustic peak in the power spectrum is strongly sensitive to the total density of matter, while the relative heights of the odd and even peaks are sensitive to the ratio of baryonic to non-[baryonic matter]…