Physics

We consider unitary Conformal Field Theory in dimensions D higher than two with a finite central charge. We assume that CFT contains conserved current of spin higher than two. We analyze the consequences of this fact. We focus on the case of D=3 and...

I will present the open string tree level amplitude of massless states to any number of external legs. It turns out that the kinematic factor of disk amplitudes is entirely captured by the underlying SYM field theory, i.e. that all the dependence on...

I discuss how to combine the physical constraints, in particular the operator product expansion for Wilson loops, with the technical power of the "symbol" of pure transcendental functions. The combination can be used to evaluate the (symbol for the...

The holographic principle is puzzling: how can it be that degrees of freedom on the boundary of a spacetime region give rise to approximately local physics in the interior? I will review some aspects of the emergence of local AdS physics from the...

In this talk I will attempt to answer a simple question, "why do polylogs appear in loop level scattering amplitudes?". There will be an interesting twist as we will find not a single answer, but two. One will be based on an analysis of branch...

We provide dramatic evidence that `Mellin space' is the natural home for correlation functions in CFTs with weakly coupled bulk duals. In Mellin space, CFT correlators have poles corresponding to an OPE decomposition into `left' and `right' sub...