Date of Award

Spring 1-1-2012

Document Type


Degree Name

Doctor of Philosophy (PhD)



First Advisor

Senarath P. de Alwis

Second Advisor

William T. Ford

Third Advisor

Oliver DeWolfe


IIB string theory represents one of the most promising realizations of string theory studied to date because it successfully handles a variety of phenomenological issues. These issues include mechanisms for stabilizing all relevant moduli fields, generating a small cosmological constant and breaking supersymmetry on a low scale. In this dissertation we examine these issues and describe the phenomenological consequences of a class of realistic IIB models that have the potential to effect both LHC physics and cosmology. In addition, we explore ways to embed interesting physical models, such as the QCD axion, within this class of IIB models.