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The Quantum Vacuum in Quantum Theory, Quantum Field Theory and Contemporary Cosmology

Zolfi, Hamed | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48830 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Golshani, Mehdi
  7. Abstract:
  8. In this thesis a brief review of the concept of vacuum has been studied. In addition, we shall see how we can determine the vacuum energy in a flat space-time. Also the renormalization and the regularization of zero point energy, which is 122 order of magnitude more than the critical density energy, has been represented. Then, we study supersymmetry which is a candidate to solve this problem. Furthermore, different ways to determine cosmological constant and the orbits of planets has been studied.Finally, by studying free fall experiments, the gravitational properties of vacuum has been represented.Caisimir effect, one of the most amazing predictions in the history of physics, and Lamb shift, which seem to indicate the physical existence and measurability of the quantum field’s zero-point energy, have been reviewed.In this thesis, the attractive force between metallic surfaces, predicted by Casimir in 1948, and measured nearly 50 years after its prediction, has been considered .However, this measurement does not definitely prove the reality of zero-point energy, because another way of interpreting this phenomenon which doesn’t use any zero-point energy, is Lifshitz’s model.Theory is now lagging the experiment but the idea that boundaries can affect the zero-point fluctuations of a system has had widespread application
  9. Keywords:
  10. Cosmological Constant ; Supersymmetry ; Ether ; Renormalization Group ; Casimir Force ; Quantum Vacuum ; Lamb Shift

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