In the first part, I will discuss axion and gauge field coupling phenomenology during inflation via density perturbations and GW. I will also combine this section with probing small scales of inflationary perturbations via CMB distortions and GW interferometers. In the second part, I will discuss probing light bosons (even if they are subdominant part of dark matter), specifically the range e-26 to e-23 eV via pulsar timing arrays, up to e-21 eV via halo mass function, e-21 to e-17eV via SMBH superradiance and e-12 to e21 eV via primordial black hole superradiance. I will conclude with near and far future paths I want to explore.
This IFIC Seminar has received funding/support from the GVA Research Project "Understanding non-perturbativie Phenomena in fundamental physics" (PROMETEO/2021/083)
