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