  In this thesis, we aim to find the asymptotic symmetries of the Kalb-Ramond
field in four dimensions at future null infinity. We start by reviewing the
asymptotic symmetries of electrodynamics in four-dimensional Minkowski
spacetime at future null infinity. We continue by investigating the asymptotic
symmetries of the Kalb-Ramond field at future null infinity. We motivate the
fall-off conditions by demanding the finiteness of energy, momentum, angular
momentum and charge flux through future null infinity. We expand the gauge
fields in ``radial" and Lorenz gauge and compute the generating charges. Using
the duality between the Kalb-Ramond theory and the scalar field in two
dimensions, we again derive the fields' fall-off conditions and compare them to
the ones obtained above. Our findings can be summarized as follows: The
different gauges yield two similar generating charges, however, the charge
obtained in the ``radial" gauge vanishes at infinity. This result might
indicate that the fall-off conditions are too strict in this gauge. We observe
consistency in the asymptotic behaviours of Kalb-Ramond and scalar field
theories. Even after we expanded both fields asymptotically, the fall-off
conditions for the Kalb-Ramond field obtained by duality considerations are
compatible with those derived from the finiteness conditions above. This might
also allow us to address the question asked in \cite{Campiglia2018} about which
are the missing asymptotic symmetries generated by the soft charges of scalar
fields.
