Chris White (QMUL)
A correspondence called the double copy relates quantities in gauge and
gravity theories, as well as a novel scalar theory with two types of
colour charge (“biadjoint scalar theory”). It is not yet known whether
the double copy is fully non-perturbative, and previous attempts to
double copy nonperturbative solutions of biadjoint scalar theory have
failed. In this talk, we look for Euclidean solutions of biadjoint
scalar theory, hoping that they might be related to gauge / gravity
instantons. Mysteriously, however, the simplest nonlinear Euclidean
solutions vanish in precisely four spacetime dimensions. We resolve the
puzzle as to why this happens, and comment on the implications for how
to double copy instantons in general.
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