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Particles, strings, fields and application to cosmology

Abstract : This thesis aims for a better understanding of supersymmetry breaking mechanisms in string theory, their low-energy effective descriptions, and their role in cosmological applications. We first review indispensable supersymmetry tools, before addressing the issue of N=2 → N=1 partial global supersymmetry breaking. In this context, we study the most general deformation of a vector multiplet and show that it corresponds to the magnetic dual of a triplet of Fayet-lliopoulos parameters. The study of non-linear realizations of partial breaking leads us to analyze the details of supersymmetric Dirac-Born-Infeld actions and their uniqueness, in particular through explicit computations of their fermionic contributions. In a second part, we review string theory elements with a particular accent on type IIB compactification ingredients. We then study the inflationary possibilities of a type IIB string theory moduli stabilization scenario with D7-branes using logarithmic quantum corrections to the Kähler potential. We show that a new type of inflationary scenario can successfully be implemented near a metastable de Sitter vacuum. The value of the vacuum energy in this scenario is nevertheless imposed by the inflationary stage. We discuss the possibility of fitting hybrid inflation with this moduli stabilization inflationary scenario. We show how to construct waterfall fields at the D7-brane intersections, study their effective theory description and explain how they can drive the end of inflation and lower the global minimum of the scalar potential towards the almost vanishing value describing our Universe.
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Submitted on : Friday, January 7, 2022 - 11:09:08 AM
Last modification on : Sunday, January 9, 2022 - 3:29:37 AM
Long-term archiving on: : Friday, April 8, 2022 - 6:40:34 PM


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  • HAL Id : tel-03516470, version 1


Osmin Lacombe. Particles, strings, fields and application to cosmology. High Energy Physics - Theory [hep-th]. Sorbonne Université, 2021. English. ⟨NNT : 2021SORUS197⟩. ⟨tel-03516470⟩



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