  Discovering alternative ways to drive domain wall (DW) dynamics is crucial
for advancing spintronic applications. Here we demonstrate via atomistic spin
dynamics simulations that optical torques can efficiently drive 90^{\circ} DWs
in the Mn2Au antiferromagnet but their spatial symmetry forbids the motion of
180^{\circ} walls. In the steady-state regime, the kinematics display special
relativity signatures accessed for low laser intensities. At velocities higher
than the magnonic limit, the DW enters a proliferation regime in which part of
its relativistic energy is invested into the nucleation of novel magnetic
textures. Our investigation contributes towards the fundamental understanding
of opto-magnetic effects, supporting the development of next generation,
all-optically controlled antiferromagnetic spintronics.
