Title: Broken symmetries and signatures
Description: We consider three possible extensions of the Standard Model. In the first model, we explore the possibility to solve the strong CP problem and flavor puzzle in a model with fermions in the bulk of a warped extra dimensions, making use of the enhanced spacetime symmetries present in extra dimensions. In the second, we systematically explore the possible low-energy spectrum arising from gauge-mediated supersymmetry breaking when the messenger sector obeys a U (1) R-symmetry and all allowed renormalizable operators in the messenger sector are included. In the third, we study single-field models of inflation using an effective theory for the pions of spontaneously broken time translation invariance and explicitly prove a consistency relation for the three-point function of density perturbations.