A bstract We construct cosmological spacetimes with a self-dual Weyl tensor whose
dynamics are described by conformally coupled scalars with only cubic self-interactions …

A bstract Superrotations are local extensions of the Lorentz group at null infinity that have
been argued to be symmetries of gravitational scattering. In their smooth version, they can …

A bstract We investigate\(\mathcal {O}\)(r N) asymptotic symmetries for a two-form gauge
field in four-dimensional Minkowski spacetime. By employing symplectic renormalization, we …

In this paper we construct a non-perturbative action of the higher spin symmetry algebra on
the gravitational phase space. We introduce a symmetry algebroid $\mathcal {T} $ which …

We construct a non-perturbative action of the higher spin symmetry algebra on the
asymptotic Yang-Mills phase space. We introduce a symmetry algebroid which admits a …

We revisit the gravitational boundary action at null infinity of asymptotically flat spacetimes.
We fix the corner ambiguities in the boundary action by using the constraint that (exponential …