Friedmann Equation demonstration - Liddle

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SUMMARY

The forum discussion centers on the Friedmann Equation as presented in "Introduction to Modern Cosmology" by Andrew Liddle, specifically addressing Equation (3.4) related to the potential energy of a test particle. A participant questions the accuracy of the equation, suggesting a missing factor of 2 in the denominator. However, others confirm that Equation (3.4) is correct as stated. For further clarification, Liddle provides corrections on his website.

PREREQUISITES
  • Understanding of the Friedmann Equation in cosmology
  • Familiarity with potential energy concepts in physics
  • Basic knowledge of cosmological models and equations
  • Access to "Introduction to Modern Cosmology" by A. Liddle
NEXT STEPS
  • Review the corrections provided by Andrew Liddle on his website
  • Study the derivation of the Friedmann Equation in detail
  • Explore potential energy equations in classical mechanics
  • Investigate the implications of the Friedmann Equation in modern cosmology
USEFUL FOR

Students of cosmology, physicists interested in gravitational theories, and anyone studying the Friedmann Equation and its applications in modern cosmological models.

go quantum!
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Are you confortable with the demonstration in page 19 of Introduction to Modern Cosmology - A. Liddle ? My problem is in particular eq. (3.4) when he writes the potential energy of a test particle. I think there is a factor of 2 missing in the denominator.
 
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Equation 3.4 looks OK to me. He posts corrections on:

http://astronomy.sussex.ac.uk/~andrewl/cosbook.html
 
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