References
Cosmological Expansion - Wikipedia
https://en.wikipedia.org/wiki/Expansion_of_the_universe
Dark Matter - Wikipedia
https://en.wikipedia.org/wiki/Dark_matter
Dark Energy - Wikipedia
https://en.wikipedia.org/wiki/Dark_energy
Galaxy Rotation Curve - Wikipedia
https://en.wikipedia.org/wiki/Galaxy_rotation_curve
Virial Theorem - Wikipedia
https://en.wikipedia.org/wiki/Virial_theorem
Lambda-CDM Model - Wikipedia
https://en.wikipedia.org/wiki/Lambda-CDM_model
Scale Factor - Wikipedia
https://en.wikipedia.org/wiki/Scale_factor_(cosmology)
Annihilation (Particle Physics) - Wikipedia
https://en.wikipedia.org/wiki/Annihilation
“Dark Matter--Hot or Not?” - Phys.org
https://phys.org/news/2016-08-dark-matterhot.html
Hot Dark Matter - Wikipedia
https://en.wikipedia.org/wiki/Hot_dark_matter
Cold Dark Matter - Wikipedia
https://en.wikipedia.org/wiki/Cold_dark_matter