Weinberg Paper: Understanding Two Loop Corrections for Gravitational Force

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SUMMARY

The forum discussion centers on the interpretation of two-loop corrections in quantum field theory (QFT) as presented in Steven Weinberg's paper on the cosmological constant problem. Specifically, it addresses Zeldovich's assumption that higher-order effects, particularly the gravitational force arising from vacuum fluctuations, are significant. The conversation highlights the relationship between two-loop Feynman diagrams and gravitational interactions, clarifying misconceptions about QFT's applicability to gravity.

PREREQUISITES
  • Understanding of quantum field theory (QFT)
  • Familiarity with Feynman diagrams and their significance
  • Knowledge of gravitational interactions in theoretical physics
  • Basic grasp of the cosmological constant problem
NEXT STEPS
  • Read Steven Weinberg's paper on the cosmological constant problem
  • Study the role of vacuum fluctuations in quantum field theory
  • Explore the implications of two-loop corrections in particle physics
  • Investigate the relationship between gravity and quantum mechanics
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The discussion is beneficial for theoretical physicists, cosmologists, and students of quantum field theory seeking to deepen their understanding of gravitational interactions and the cosmological constant problem.

romeo6
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I have been reading a Weinberg paper (the cosmological constant problem), where he writes

"...Zeldovich assumed that these were canceled leaving only the higher order effects: in particulal, the gravitational force between the particles in the vacuum fluctuations. (In Feynman diagram terms, this corresponds to throwing away te one-loop graphs, but keeping those with two loops"

Can someone help me understand this. I thought QFT said nothing about gravity. Why do the two loops correspond to the gravitational force??
 
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anyone??

:)
 
You might have better luck if you cite the paper.
 

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