The axion is a light pseudoscalar particle postulated to solve issues with the Standard
Model, including the strong CP problem and the origin of dark matter. In recent years, there …

A bstract The linear dilaton geometry in five dimensions, rediscovered recently in the
continuum limit of the clockwork model, may offer a solution to the hierarchy problem which …

A bstract We introduce a set of clockwork models of flavor that can naturally explain the large
hierarchies of the Standard Model quark masses and mixing angles. Since the clockwork …

We revisit the scenario of a massive spin-2 particle as the mediator for communicating
between dark matter of arbitrary spin and the Standard Model. Taking the general couplings …

We study a class of gauge groups that can automatically yield a perturbatively exact Peccei-
Quinn symmetry, and we outline a model in which the axion quality problem is solved at all …

We study QCD axion or cosmological axion-like particles (ALPs) in a model inspired by the
recent interest in 4-dimensional clockwork models, with the global symmetry being …

Many proposals for physics beyond the Standard Model give rise to a dark sector containing
many degrees of freedom. In this work, we explore the cosmological implications of the …

The recent pulsar timing arrays (PTAs) nano-Hz gravitational wave (GW) background signal
can be naturally induced by the annihilation of domain walls (DWs) formed at a symmetry …

The clockwork mechanism would be completely spoiled by the presence of a cosmological
constant in the bulk of its 5D construction, or by analogous terms in the discrete case. It is …

A bstract We consider various bulk fields with general dilaton couplings in the linear dilaton
background in five dimensions as the continuum limit of clockwork models. We show that the …