Newtonian cosmology vs relativistic cosmology

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SUMMARY

This discussion focuses on the comparison between Newtonian cosmology and relativistic cosmology, specifically addressing the shortcomings of Newtonian models such as the Hubble law and Friedmann equations. It highlights that General Relativity (GR) provides solutions to these shortcomings, having been extensively tested and validated. The conversation emphasizes the necessity of understanding both frameworks to appreciate the evolution of cosmological models and the foundational role of GR in modern cosmology.

PREREQUISITES
  • Understanding of Hubble's Law
  • Friedmann equations in cosmology
  • Basic principles of General Relativity
  • Concepts of fluid dynamics in cosmological contexts
NEXT STEPS
  • Research the limitations of Newtonian gravity in cosmological models
  • Study the implications of General Relativity on cosmological structures
  • Explore the Friedmann-Lemaître-Robertson-Walker (FLRW) metric
  • Investigate observational evidence supporting General Relativity in cosmology
USEFUL FOR

Students and researchers in astrophysics, cosmologists, and anyone interested in the foundational theories of the universe and the transition from Newtonian to relativistic models.

houhou.trad
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I am working on an introduction to cosmology, I have began by the Newtoniant one (the Hubble law, the Friedmann, fluid and acceleration equations), and some of the aspects of the relativitic one. I want to relate the tow parts by mentioning the shortcomings of the first, and then mentioning the solution in the second.
Hence, what are the shortcomings of the Newtonian cosmology, and what are their solutions in the context of the relativistic one.
Please help me.
 
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I am not aware of a full model of cosmology based on purely Newtonian physics. General Relativity was around for decades by the time the standard model of cosmology was developed. GR has been tested extensively and proven to be correct at every point, whereas Newtonian gravity has glaring weaknesses. Since modern cosmology is based heavily upon GR I would try to compare the two and point out what the differences are.
 

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