We present an SU(5) model in which CP is spontaneously broken at the grand unification mass scale... more We present an SU(5) model in which CP is spontaneously broken at the grand unification mass scale and which preserves all the features of the Weinberg model of CP non-conservation with natural flavor conservation. Therefore, in contrast to a model recently proposed by ...
Bonitz [Phys. Plasmas 1, 832 (1994)] has recently shown that isotropic quantum plasmas described ... more Bonitz [Phys. Plasmas 1, 832 (1994)] has recently shown that isotropic quantum plasmas described by the Linhard formula for the polarization function cannot exhibit unstable longitudinal collective excitations. This result can be valid for more general systems for which the random phase approximation or the Linhard formula for the polarization function may not be applicable.
The mass of the photon in the presence of thermal background particles is studied. We present a g... more The mass of the photon in the presence of thermal background particles is studied. We present a general proof that all contributions to the photon's thermal mass from low-temperature thermal backgrounds are suppressed by a huge exponential factor at least as large as e m e / 2kT ...
International Journal of Modern Physics, Jan 10, 1996
We give a field-theoretic treatment of the behavior of mixed neutrinos in media such as the early... more We give a field-theoretic treatment of the behavior of mixed neutrinos in media such as the early universe or the core of a supernova, where the neutrinos themselves are part of the background. The contributions to the self-energy coming from the neutrino internal lines must be calculated in terms of the propagator corresponding to the neutrino modes in the medium, instead of the thermal free propagator. The use of the effective field associated with these modes allows us to express the neutrino densities in terms of the dynamical flavor amplitudes in precise form. We show how the damping terms in the Hamiltonian matrix that governs the flavor evolution are determined from the absorptive part of the self-energy. Our work extends the thermal-field-theory method to a nonlinear problem where it was thought not to be applicable, and provides a simpler alternative to the Boltzmann-type kinetic approach.
The Standard Model of the electromagnetic and weak interactions offers no explanations for the or... more The Standard Model of the electromagnetic and weak interactions offers no explanations for the origin of the fermion mass and mixing parameters, except that they arise from Yukawa couplings, which are free parameters of the Model. The problem is worse when the question of neutrino masses is considered and, despite its remarkable success on many fronts, the Standard Model cannot explain some important experimental observations. In particular, it is not possible to describe the phenomena of neutrino oscillations that has been uncovered in recent years and, from a particle physics viewpoint, this provides the most convincing evidence for physics beyond the Standard Model. Following the trend of the previous workshops, we focus also on the presentation of the current status of the main accelerator and non-accelerator neutrino mass experiments (such as Super-Kamiokande, and SNO), the future experimental projects (e.g., MiniBoone) and some of the phenomenology related to them, as well as reviews of the theoretical and phenomenological ideas related to the question of neutrino masses and related topics such as the explanation for the observed baryon asymmetry in the universe.
Three of the most exciting areas of current fundamental research in physics are neutrino physics,... more Three of the most exciting areas of current fundamental research in physics are neutrino physics, flavor physics, and precision cosmology. Despite the remarkable success of the Standard Model of the electromagnetic and weak interactions on many fronts, there remain many unanswered questions related to important experimental observations in the areas mentioned. Following the trend of the previous workshops, the focus on this one is also the presentation of the current status of the main neutrino mass experiments, the future experimental projects related to them, as well as reviews of the theoretical and phenomenological ideas related to the question of neutrino masses, CP violation, and related topics in cosmology, such as the origin of the dark matter and dark energy, and the inflationary theory of the early universe.
The Standard Model of the electromagnetic and weak interactions offers no explanations for the or... more The Standard Model of the electromagnetic and weak interactions offers no explanations for the origin of the fermion mass and mixing parameters, except that they arise from Yukawa couplings, which are free parameters of the Model. The problem is worse when the question of neutrino masses is considered and, despite its remarkable success on many fronts, the Standard Model cannot explain some important experimental observations. In particular, it is not possible to describe the phenomena of neutrino oscillations that has been uncovered in recent years and, from a particle physics viewpoint, this provides the most convincing evidence for physics beyond the Standard Model. Following the trend of the previous workshops, we focus also on the presentation of the current status of the main accelerator and non-accelerator neutrino mass experiments (such as Super-Kamiokande, and SNO), the future experimental projects (e.g., MiniBoone) and some of the phenomenology related to them, as well as reviews of the theoretical and phenomenological ideas related to the question of neutrino masses and related topics such as the explanation for the observed baryon asymmetry in the universe.
We present an SU(5) model in which CP is spontaneously broken at the grand unification mass scale... more We present an SU(5) model in which CP is spontaneously broken at the grand unification mass scale and which preserves all the features of the Weinberg model of CP non-conservation with natural flavor conservation. Therefore, in contrast to a model recently proposed by ...
Bonitz [Phys. Plasmas 1, 832 (1994)] has recently shown that isotropic quantum plasmas described ... more Bonitz [Phys. Plasmas 1, 832 (1994)] has recently shown that isotropic quantum plasmas described by the Linhard formula for the polarization function cannot exhibit unstable longitudinal collective excitations. This result can be valid for more general systems for which the random phase approximation or the Linhard formula for the polarization function may not be applicable.
The mass of the photon in the presence of thermal background particles is studied. We present a g... more The mass of the photon in the presence of thermal background particles is studied. We present a general proof that all contributions to the photon's thermal mass from low-temperature thermal backgrounds are suppressed by a huge exponential factor at least as large as e m e / 2kT ...
International Journal of Modern Physics, Jan 10, 1996
We give a field-theoretic treatment of the behavior of mixed neutrinos in media such as the early... more We give a field-theoretic treatment of the behavior of mixed neutrinos in media such as the early universe or the core of a supernova, where the neutrinos themselves are part of the background. The contributions to the self-energy coming from the neutrino internal lines must be calculated in terms of the propagator corresponding to the neutrino modes in the medium, instead of the thermal free propagator. The use of the effective field associated with these modes allows us to express the neutrino densities in terms of the dynamical flavor amplitudes in precise form. We show how the damping terms in the Hamiltonian matrix that governs the flavor evolution are determined from the absorptive part of the self-energy. Our work extends the thermal-field-theory method to a nonlinear problem where it was thought not to be applicable, and provides a simpler alternative to the Boltzmann-type kinetic approach.
The Standard Model of the electromagnetic and weak interactions offers no explanations for the or... more The Standard Model of the electromagnetic and weak interactions offers no explanations for the origin of the fermion mass and mixing parameters, except that they arise from Yukawa couplings, which are free parameters of the Model. The problem is worse when the question of neutrino masses is considered and, despite its remarkable success on many fronts, the Standard Model cannot explain some important experimental observations. In particular, it is not possible to describe the phenomena of neutrino oscillations that has been uncovered in recent years and, from a particle physics viewpoint, this provides the most convincing evidence for physics beyond the Standard Model. Following the trend of the previous workshops, we focus also on the presentation of the current status of the main accelerator and non-accelerator neutrino mass experiments (such as Super-Kamiokande, and SNO), the future experimental projects (e.g., MiniBoone) and some of the phenomenology related to them, as well as reviews of the theoretical and phenomenological ideas related to the question of neutrino masses and related topics such as the explanation for the observed baryon asymmetry in the universe.
Three of the most exciting areas of current fundamental research in physics are neutrino physics,... more Three of the most exciting areas of current fundamental research in physics are neutrino physics, flavor physics, and precision cosmology. Despite the remarkable success of the Standard Model of the electromagnetic and weak interactions on many fronts, there remain many unanswered questions related to important experimental observations in the areas mentioned. Following the trend of the previous workshops, the focus on this one is also the presentation of the current status of the main neutrino mass experiments, the future experimental projects related to them, as well as reviews of the theoretical and phenomenological ideas related to the question of neutrino masses, CP violation, and related topics in cosmology, such as the origin of the dark matter and dark energy, and the inflationary theory of the early universe.
The Standard Model of the electromagnetic and weak interactions offers no explanations for the or... more The Standard Model of the electromagnetic and weak interactions offers no explanations for the origin of the fermion mass and mixing parameters, except that they arise from Yukawa couplings, which are free parameters of the Model. The problem is worse when the question of neutrino masses is considered and, despite its remarkable success on many fronts, the Standard Model cannot explain some important experimental observations. In particular, it is not possible to describe the phenomena of neutrino oscillations that has been uncovered in recent years and, from a particle physics viewpoint, this provides the most convincing evidence for physics beyond the Standard Model. Following the trend of the previous workshops, we focus also on the presentation of the current status of the main accelerator and non-accelerator neutrino mass experiments (such as Super-Kamiokande, and SNO), the future experimental projects (e.g., MiniBoone) and some of the phenomenology related to them, as well as reviews of the theoretical and phenomenological ideas related to the question of neutrino masses and related topics such as the explanation for the observed baryon asymmetry in the universe.
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