In this talk, I will discuss a range of approaches to better understand ultralight and light scalar dark matter candidates, including axion-like particles. I will discuss results from PySiUltraLight, a modification of the PyUltraLight code that includes self-interaction terms to model the dynamical evolution of axion fields. I will discuss work that shows that the self-interaction should not...
Axion couplings to photons could induce photon-axion conversion in the presence of magnetic fields in the Universe. This conversion could impact various cosmic distance measurements, such as luminosity distances to type Ia supernovae and angular distances to galaxy clusters, in different ways. In this talk we consider different combinations of the most up-to-date distance measurements to...
