3 problems

In Minkowski space, consider amplitudes involving massless spin-two particles, including gravitons. The existence of such particles forces the three-particle amplitudes to be Loren…

Higher-derivative beta-function structure conjecture. The structure should be very similar to that of the generic six-derivative theory: only positive powers of $x$ should appear,…

Let $u_\mu$ be a Killing vector field on a three-dimensional spacetime, either null or non-null, whose scalars are constant. In the non-null case, suppose that the Gaussian curvatu…