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Vacuum of Classical Mechanic, Quantum Field and General Relativity

Ashouri Shokri, Younes | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47164 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Golshani, Mehdi
  7. Abstract:
  8. The idea of "vacuum energy" with definition of the "Aether" has many historical backgrounds from Aristotelian philosophy to 19th century and the advent of quantum vacuum. Some assert vacuum which is defined as "pure void" and others have got contrary viewpoints. It can be said that the history of vacuum is as old as history of physics. With the advent of quantum mechanics, vacuum has taken a specific definition. Vacuum from vision of quantum mechanics describes that vacuum is the minimum possible energy state, because if the energy of "quantum vacuum state" became zero, Heisenberg uncertainty principle would be violated. The important consequence of quantum mechanics will be in apparent contradiction with classical mechanics that we will deal with. It becomes even more elaborate when we intend to compare the energy density of the vacuum from quantum mechanics with general relativity theory. Total zero-point energy calculated from the quantum field is equal in value to 120 times of real-world energy density from the cosmological observations. This issue is so crucial that Steven Weinberg called "crisis" in physics. In addition, infinite values seen in quantum field theory can be absorbed into a process called "renormalization". But when the theory confronted the gravitational field, quantum theory could not make any escape from the "infinities". Because general relativity explains that any form of energy should have a consequence of gravity, on other words, general relativity makes equivalence between geometry and space. So the crisis is that how to encounter infinite energy of quantum field to geometric interpretation of general relativity, and also it must be found a geometric interpretation for this huge energy. However, it should be clear about what the gravitational consequences of the huge energy is; perhaps it is the same dream of physicists to join the forces of nature to Grand Unified Theory
  9. Keywords:
  10. Vacuum ; Quantum ; Cosmology ; Classical Mechanics ; Quantum Field Theory ; General Relativity Theory

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