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Partager le résultat de cette recherche Interroger des sources externesÉtude de quelques modèles cosmologiques dans le cadre de la théorie Einstein-Cartan. / Abdelghani Hadjh Hammou
Titre : Étude de quelques modèles cosmologiques dans le cadre de la théorie Einstein-Cartan. Type de document : texte imprimé Auteurs : Abdelghani Hadjh Hammou, Auteur ; Sami Ryad Zouzou, Directeur de thèse Mention d'édition : 08/07/2020 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2020 Importance : 96 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : physique: Physique Théorique théorie Einstein-Cartan cosmologie torsion loi de Gauss faible matière noire déflexion de la lumière modèle d’Einstein-Strauss Einstein-Cartan theory cosmology weak Gauss law dark matter deflection of light Einstein-Strauss model نظرية أينشتاين-كارتان الكوسملوجيا إنفتال الزمكان قانون غوس الضعيف المادة المظلمة إنحناء الضوءة نموذج آينشتاين-شتراوس Index. décimale : 530 Physique Résumé :
In this thesis, we have studied a few cosmological models in the framework of the Einstein-Cartan theory, that is to say, by including another geometric properties of space-time which is the torsion . We first treated the Kottler spherical symmetric static model in the case of a ompletely antisymmetric Cartan tensor. In addition to being the only case with physical significance, it allows autoparalleles to coincide with geodesics. Using the covariant non-conservation equation, a feature that differentiates the Einstein-Cartan theory from general relativity, it has been shown that the weak Gauss law is no longer true. This mechanism allowed us to hypothesize that torsion could be an alterative to dark matter. It was then shown that the effect of this torsion could dominate that of the cosmological constant in the phenomenon of the deflection of light by a gravitational lens. Another model of interest in this thesis is that of Einstein-Strauss, which connects Kottler’s metric inside the Schücking sphere to the Robertson-Walker metric outside the Schücking sphere. this. Taking into account the spacetime twist generated by the material distribution, we have encountered a mass problem which proves to be variable in this case, which represents a violation of the principle of mass conservation.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/physique/HAD7628.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11464 Étude de quelques modèles cosmologiques dans le cadre de la théorie Einstein-Cartan. [texte imprimé] / Abdelghani Hadjh Hammou, Auteur ; Sami Ryad Zouzou, Directeur de thèse . - 08/07/2020 . - جامعة الإخوة منتوري قسنطينة, 2020 . - 96 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : physique: Physique Théorique théorie Einstein-Cartan cosmologie torsion loi de Gauss faible matière noire déflexion de la lumière modèle d’Einstein-Strauss Einstein-Cartan theory cosmology weak Gauss law dark matter deflection of light Einstein-Strauss model نظرية أينشتاين-كارتان الكوسملوجيا إنفتال الزمكان قانون غوس الضعيف المادة المظلمة إنحناء الضوءة نموذج آينشتاين-شتراوس Index. décimale : 530 Physique Résumé :
In this thesis, we have studied a few cosmological models in the framework of the Einstein-Cartan theory, that is to say, by including another geometric properties of space-time which is the torsion . We first treated the Kottler spherical symmetric static model in the case of a ompletely antisymmetric Cartan tensor. In addition to being the only case with physical significance, it allows autoparalleles to coincide with geodesics. Using the covariant non-conservation equation, a feature that differentiates the Einstein-Cartan theory from general relativity, it has been shown that the weak Gauss law is no longer true. This mechanism allowed us to hypothesize that torsion could be an alterative to dark matter. It was then shown that the effect of this torsion could dominate that of the cosmological constant in the phenomenon of the deflection of light by a gravitational lens. Another model of interest in this thesis is that of Einstein-Strauss, which connects Kottler’s metric inside the Schücking sphere to the Robertson-Walker metric outside the Schücking sphere. this. Taking into account the spacetime twist generated by the material distribution, we have encountered a mass problem which proves to be variable in this case, which represents a violation of the principle of mass conservation.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/physique/HAD7628.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11464 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité HAD/7628 HAD/7628 Thèse Bibliothèque principale Thèses Disponible
Titre : Quelques problËmes en relativité et cosmologie : Théorie d’einstein-cartan comme alternative au problème de la matière sombre, théorie F(R) et transformation de Lorentz à l’échelle macroscopique Type de document : texte imprimé Auteurs : Amine Benachour, Auteur ; Sami Ryad Zouzou, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 98 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Einstein-Cartan theory Spherical symmetry Exact solutions Mass formula Dark matter f(R) theory Ricci scalar Common solutions Lorentz transformation Length contraction Thought experiment Tape measure Simultaneity Macroscopic scale Théorie d’Einstein-Cartan Symétrie sphérique Solutions exactes Formule de masse Matière sombre Théorie f(R) Scalaire de Ricci Solutions communes Transformation de Lorentz Contraction des longueurs Expérience de pensée Mètre ruban Simultanéité Echelle macroscopique نظرية أينشتاين كارتن تناظر كروي حلول المعادلات قانون الكتلة المادة المظلمة نظرية f(R) ثابت الانحناء حلول مشتركة تحويل لورنز تقلص الأطوال تجربة فكرية شريط قياس تزامن مقياس عيانى Index. décimale : 530 Physique Résumé : Some current issues in cosmology lead us to consider theories of gravitation other than general relativity. It is in this context that this thesis is being taken by considering first the Einstein-Cartan theory for static and spherically symmetric spacetime where obtaining exact solutions has led to a general formula linking the internal mass of an object with spherical symmetry to its external mass, highlighting a difference in mass that would likely to provide an explanation for the dark matter problem in the universe. Another theory of gravitation which has been studied in this thesis often proposed as an alternative to the problem of dark energy; is the f(R) theory where the emphasis has been placed on its close link with general relativity by demonstrating the necessary and sufficient condition for a metric to be a solution of the two theories; whose consequences made possible the construction of f(R) theories equivalent to general relativity for a specific form of the Ricci scalar; and set the conditions on the parameters of a given model to have such equivalence. Finally, following the analysis of a thought experiment involving the measurement of the distance between two observers in motion by a tape measure, certain problems related to the application of the Lorentz transformation at the macroscopic scale have also been investigated and solved. Diplôme : Doctorat en sciences En ligne : ../theses/physique/BEN7376.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11025 Quelques problËmes en relativité et cosmologie : Théorie d’einstein-cartan comme alternative au problème de la matière sombre, théorie F(R) et transformation de Lorentz à l’échelle macroscopique [texte imprimé] / Amine Benachour, Auteur ; Sami Ryad Zouzou, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 98 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Einstein-Cartan theory Spherical symmetry Exact solutions Mass formula Dark matter f(R) theory Ricci scalar Common solutions Lorentz transformation Length contraction Thought experiment Tape measure Simultaneity Macroscopic scale Théorie d’Einstein-Cartan Symétrie sphérique Solutions exactes Formule de masse Matière sombre Théorie f(R) Scalaire de Ricci Solutions communes Transformation de Lorentz Contraction des longueurs Expérience de pensée Mètre ruban Simultanéité Echelle macroscopique نظرية أينشتاين كارتن تناظر كروي حلول المعادلات قانون الكتلة المادة المظلمة نظرية f(R) ثابت الانحناء حلول مشتركة تحويل لورنز تقلص الأطوال تجربة فكرية شريط قياس تزامن مقياس عيانى Index. décimale : 530 Physique Résumé : Some current issues in cosmology lead us to consider theories of gravitation other than general relativity. It is in this context that this thesis is being taken by considering first the Einstein-Cartan theory for static and spherically symmetric spacetime where obtaining exact solutions has led to a general formula linking the internal mass of an object with spherical symmetry to its external mass, highlighting a difference in mass that would likely to provide an explanation for the dark matter problem in the universe. Another theory of gravitation which has been studied in this thesis often proposed as an alternative to the problem of dark energy; is the f(R) theory where the emphasis has been placed on its close link with general relativity by demonstrating the necessary and sufficient condition for a metric to be a solution of the two theories; whose consequences made possible the construction of f(R) theories equivalent to general relativity for a specific form of the Ricci scalar; and set the conditions on the parameters of a given model to have such equivalence. Finally, following the analysis of a thought experiment involving the measurement of the distance between two observers in motion by a tape measure, certain problems related to the application of the Lorentz transformation at the macroscopic scale have also been investigated and solved. Diplôme : Doctorat en sciences En ligne : ../theses/physique/BEN7376.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11025 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEN/7376 BEN/7376 Thèse Bibliothèque principale Thèses Disponible
