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Symétries et brisures de symétries au-delà de la théorie électrofaible

Abstract : The Glashow-Salam-Weinberg theory describing electroweak interactions is one of the best successes of quantum field theory; it has passed all the experimental tests of particles physics with a high accuracy. However, this theory suffers from some deficiencies in the sense that some parameters, especially those involved in the generation of the mass of the elementary particles, are fixed to unnatural values. Moreover gravitation whose quantization cannot be achieved in ordinary quantum field theory is not taken into account. The aim of this PhD dissertation is to study some theories beyond the Standard Model and inspired by superstring theories. My endeavour has been to develop theoretical aspects of an effective dynamical description of one of the solitonic states of the strongly coupled strings. An important part of my results is also devoted to a more phenomenological analysis of the low energy effects of the symmetries that assure the coherence of the theories at high energy: these symmetries could explain the fermion mass hierarchy and could be directly observable in collider experiments. It is also shown how the geometrical properties of compactified spaces characterize the vacuum of string theory in a non-perturbative regime; such a vacuum can be used to construct a unified theory of gauge and gravitational interactions with a supersymmetry softly broken at a TeV scale.
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https://tel.archives-ouvertes.fr/tel-00000813
Contributor : Marc Gingold <>
Submitted on : Friday, October 12, 2001 - 12:00:00 AM
Last modification on : Wednesday, September 12, 2018 - 2:13:58 PM
Long-term archiving on: : Tuesday, September 11, 2012 - 1:00:17 PM

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Christophe Grojean. Symétries et brisures de symétries au-delà de la théorie électrofaible. Physique mathématique [math-ph]. Université Paris Sud - Paris XI, 1999. Français. ⟨tel-00000813⟩

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