Quantum Theory of Fields and Properties of Quantum Systems
American Journal of Physics and Applications
Volume 7, Issue 4, July 2019, Pages: 93-100
Received: Apr. 27, 2019; Accepted: Jun. 3, 2019; Published: Jul. 4, 2019
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Fernand Tshizanga Mpinga, Department of Mechanics, Superior Institute of Applied Techniques, Kinshasa, Democratic Republic of Congo
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Quantum theory of fields is the most general theory to date. It has an extremely wide field of application: - the physics of elementary particles and their interactions (summarized by the Standard Model); - the physics of the universe close to the Big Bang (primordial fluctuations from which the formation of the structure of the universe originates, evaporation of black holes, Hawking radiation); - the formalism of condensed matter physics, with applications such as superconductivity, superfluidity, phase transitions. Indeed, the quantum theory of fields has been successfully implemented in quantum systems, notably in research on fundamental state energy, elementary excitations spectrum, degeneracy parameters: long range order, Bogoliubov approximation, density matrix diagonalization,…, as well as the characteristics of these systems: movement equation, dynamics of the system,…. Three different quantum systems were concerned in this theoretical study: - a gas of identical atoms of spin zero confined into the trap; - electron gas of spin ½ into the metal; - and a gathering of identical ions of spin zero at high density confined into a radiofrequency linear Paul trap. The microscopic theory was used in the each case and the results obtained by the researchers are presented.
Quantum Theory of Fields, Quantum Systems, Microscopic Theory, Bosons, Fermions, Second Quantization, Density Matrix, Fundamental State Energy
To cite this article
Fernand Tshizanga Mpinga, Quantum Theory of Fields and Properties of Quantum Systems, American Journal of Physics and Applications. Vol. 7, No. 4, 2019, pp. 93-100. doi: 10.11648/j.ajpa.20190704.11
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