Naturalness has for many years been a guiding principle in the search for physics beyond
the Standard Model, particularly for understanding the physics of electroweak symmetry …

We give an explicit realization of the “StringAxiverse” discussed in Arvanitaki et. al [1] by
extending our previous results on moduli stabilization in M theory to include axions. We …

We study cosmological effects of explicit Peccei-Quinn breaking on the QCD axion dark
matter. We find that the axion abundance decreases or increases significantly depending on …

A bstract We investigate the possibility that the Peccei-Quinn phase transition occurs at a
temperature far below the symmetry breaking scale. Low phase transition temperatures are …

Dark matter candidates with electromagnetic dipole moments can arise as dark baryons in
gauge-mediated or technicolor models. These dark matter candidates interact with nuclei in …

We explore a dynamical mechanism to realize the emergence of a global U (1) PQ symmetry
and its spontaneous breaking at an intermediate scale for an axion solution to the strong CP …

We discuss the physics of moduli (light scalar fields with Planck-suppressed couplings to
matter) in the case of low-scale supersymmetry breaking such as gauge mediation. We …

We show that the hybrid inflation is naturally realized in the framework of a supersymmetric
axion model, which is consistent with the WMAP observation if the Peccei-Quinn symmetry …

If nature exhibits low energy supersymmetry, discrete (non-Z 2) R symmetries may well play
an important role. In this paper, we explore such symmetries. We generalize gaugino …

We examine dark matter production rates in supersymmetric (SUSY) axion models typified
by the mass hierarchy m 3/2≪ m (neutralino)≪ m (axino). In such models, one expects the …