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This document presents a derivation of the Friedmann equation for a Newtonian universe, showing that it aligns with the general relativity framework by substituting mass density with energy density. It discusses the implications of pressure from radiation and vacuum energy, providing a foundational understanding of cosmology for undergraduates through practical calculations. The paper includes thirty-one problems to explore various aspects of cosmic expansion, energy density, and the role of general relativ
- Author
- plarregain
- Language
- EN