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Title
Abstract
Chapter 1 Introduction
Introduction to Compactification
Conclusions and Outlook
Introduction
Conclusion
Conclusions
References
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Physics

Aspects of Particle Physics and Cosmology from String/M Theory

Profile image of Chakrit PongkitivanichkulChakrit Pongkitivanichkul

2016

Abstract

This thesis is focused on various aspects of particle physics and cosmology from String/M theory. Assuming our universe is a solution of string/M theory, physics below the unification scale is an effective 4D supergravity theory with an abundance of moduli and axions. The phenomenology of moduli and axions in an early universe is studied. We particularly study dark radiation constraints on a generic Axiverse scenario and provide various solutions to it. The simplest solution requires the lightest modulus decays only into its own axion superpartner and this severely constrains the moduli Kahler potential and mass matrix. We also study a model building aspect of string/M theory. It has been shown that a discrete symmetry on a manifold with G2 holonomy combined with symmetry breaking Wilson lines provide a solution to the doublet-triplet splitting problem. We extend the idea to a new class of model based on M theory compactified on a G2 manifold which leads to a novel solution where th...

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