Relaxion Stars and their detection via Atomic Physics
  The cosmological relaxion can address the hierarchy problem, while its
coherent oscillations can constitute dark matter in the present universe. We
consider the possibility that the relaxion forms gravitationally bound objects
that we denote as relaxion stars. The density of these stars would be higher
than that of the local dark matter density, resulting in enhanced signals in
table-top detectors, among others. Furthermore, we raise the possibility that
these objects may be trapped by an external gravitational potential, such as
that of the Earth or the Sun. This leads to formation of relaxion halos of even
greater density. We discuss several interesting implications of relaxion halos,
as well as detection strategies to probe them.
