Archive of IAS Friday High Energy Theory Seminars

I will introduce a technique in studying the analytic structure of perturbative S-matrix of QFTs. The main idea is to associate Feynman integrals to objects in a projective space: polytopes and hypersurfaces. At one loop, this reveals a universal...

I will discuss how to relate the entropy of BPSblack holes in AdS to counting of states in gaugetheory, presenting examples where this can besuccessfully done as well as examples where thisdoes not seem to work.

When a M5 branes probes the singular locus of the D,E type ALE orbifold, the M5 brane exhibits fractionation, which corresponds to activating tensor branch moduli of the 6d N=(1,0) SCFT living on the M5. I explain how the fractionation patterns can...

I review the on-shell approach to loop amplitudes, and its implementation in the BlackHat library. I present a selection of recent calculations done using the library. These include next-to-leading order calculations of electroweak vectors...

Abstract: Soft theorems for the scattering of low energy photons and gravitons and cosmological consistency relations on the squeezed-limit correlation functions are both understood to be consequences of invariance under large gauge transformations...

One can easily be frustrated by the tremendous redundancy in possible physical description. By this I mean the freedom to choose gauge, make field redefinitions, add any amount of auxiliary spectator matter, and the such. Happily we can exploit...

I review the use of maximal unitarity at two loops, and how to phrase it in terms of multivariate contour integrals. I show how to use maximal unitarity to reconstruct the ABDK relation between one- and two-loop amplitudes with four and five...

We study 2d (0,2) quiver gauge theories on the world-volume of D1-branes probing singular toric Calabi-Yau 4-folds. The gauge theories for arbitrary toric singularities are constructed by means of partial resolution. Each gauge theory is expected to...