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dc.contributor.authorRaimondo, Gianluca
dc.date.accessioned2014-05-14T11:42:18Z
dc.date.available2014-05-14T11:42:18Z
dc.date.issued2012-04-26
dc.identifier.urihttp://hdl.handle.net/10556/1304
dc.identifier.urihttp://dx.doi.org/10.14273/unisa-182
dc.description2010 - 2011en_US
dc.description.abstractIn this thesis I will discuss the theory of two level systems and the theory of the oscillating particles in quantum eld theory. In the rst chapter I will consider the time evolution of a two level system, a qubit, to show that it has inside a local in time gauge invariant evolution equation. I construct the covariant derivative operator and show that it is related to the free energy. The gauge invariance of the time evolution of the two level system is analogous to the phenomenon of birefringence.I also show that the two level systems present a Berry-like and an Anandan-Aharonov phase. Finally, I discuss entropy environment e ects and the distance in projective Hilbert space between two level states to show that the last one is properly related to the Aharonov - Anandan phase. In the second chapter I review the result obtained in QFT for particle mix- ing, analyzing the theoretical construction and the oscillation formula in the fermion case.I will emphasize the di erences between the quantum mechan- ics formulas and the QFT formulas.The unitary inequivalence between the avor and the mass eigenstates is also shown and the structure of the current for charged elds is nally discussed. I found a non - perturbative vacuum structure for the mixing particles that, among the other things, will lead to a non zero contribution to the value of the cosmological constant (chapter 3). Several links between rst and second chapter will arise from this thesis and will shed the light on the fact that it is possible to construct a generic two level quantum eld theory, that is an extension of the quantum mechanics bit theory in a quantum eld theory framework. [edited by author]en_US
dc.language.isoenen_US
dc.publisherUniversita degli studi di Salernoen_US
dc.subjectMixingen_US
dc.subjectQ-biten_US
dc.subjectGaugeen_US
dc.subjectQFTen_US
dc.titleParticle mixing, two level systems and gauge theoryen_US
dc.typeDoctoral Thesisen_US
dc.subject.miurFIS/02 FISICA TEORICA, MODELLI E METODI MATEMATICIen_US
dc.contributor.coordinatoreGrella, Giuseppeen_US
dc.description.cicloX n.s.en_US
dc.contributor.tutorVitiello, Giuseppeen_US
dc.identifier.DipartimentoFisicaen_US
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