My research focusses on scattering amplitudes, the main quantity of interest in quantum field theory. In recent years, the scattering amplitudes programme has had a significant impact on our understanding of the mathematical structure of perturbative quantum field theories and gravity. The `on-shell' philosophy espoused by the amplitudes community, i.e. bootstrapping gauge-invariant on-shell amplitudes from physical consistency conditions alone, has lead to a number of incredible simplifications along with a plethora of new ways to understand old problems. One example is the BCJ duality/double copy, and while it is true that these advances have rendered previously impossible calculations trivial, this simple fact far understates the progress that has been made in, for example, understanding the underlying mathematical structure of scattering amplitudes. One stark difference between the modern approach to scattering amplitudes when compared with the path-integral approach is the fact that the modern approach doesn't assume the existence of spacetime: the only local quantities we are worried about are the initial and final states of a given scattering event, rather than trying to understand what happens between these events. It turns out that relaxing the notion that things in between measurements are local allows for incredible simplification and, intriguingly, opens up the possibility that we may be able to change our understanding of spacetime altogether.
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