New constraints on axion-gauge field dynamics during inflation from $Planck$ and BICEP/Keck data sets

Paolo Campeti, Ogan Özsoy, Ippei Obata +1

We present new constraints on spectator axion-$\mathrm{U}(1)$ gauge field interactions during inflation using the latest $Planck$ (PR4) and BICEP/Keck 2018 data releases. This model c…