Cosmological constant estimation in QFT

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SUMMARY

The discussion centers on the estimation of the cosmological constant within Quantum Field Theory (QFT) and its implications. Andrei highlights the discrepancy of 120 orders of magnitude between predicted vacuum energy values and observed measurements, indicating fundamental flaws in current assumptions. He emphasizes that the QFT vacuum energy is not directly measurable but rather defined, suggesting that General Relativity (GR) may provide a framework for reconciling these values. The conversation underscores the need for a deeper understanding of the relationship between vacuum energy and gravitational effects.

PREREQUISITES
  • Quantum Field Theory (QFT) fundamentals
  • General Relativity (GR) principles
  • Understanding of vacuum energy concepts
  • Measurement theory in quantum mechanics
NEXT STEPS
  • Investigate the implications of vacuum energy in General Relativity
  • Explore the discrepancies in cosmological constant estimations
  • Study the role of zero-point energy in various fields of physics
  • Examine alternative theories addressing vacuum energy in QFT
USEFUL FOR

The discussion is beneficial for theoretical physicists, cosmologists, and researchers focused on quantum mechanics and gravitational theories, particularly those interested in the cosmological constant and vacuum energy challenges.

ueit
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My question is about the interpretation of the large estimated value. In QM we are supposed to think in terms of measurement results and not of ontological properties. So, if QFT predicts a large vacuum energy what is the correct approach?

1. The predicted value is the result you get if you measure the vacuum energy.
2. The predicted value is an intrinsic property of the vacuum and should therefore gravitate.

Thanks,

Andrei
 
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Well, the predictions are off by 120 orders of magnitude, which means some assumptions are incorrect. The QFT vacuum energy isn't something that is measured, but just defined. The zero point of energy is completely arbitrary in every field of physics except for general relativity. So you could use GR to define the "measured" vacuum energy, and try to look for ways to get that value in QFT. So far, unsuccessful.
 

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