Archive of IAS Friday High Energy Theory Seminars

Apr
29
2016

High Energy Theory Seminar

Efficiency=Geometry? Decoding the DNA of Prediction in Gauge, Gravity and Effective Field Theories
John J. Carrasco
1:45pm|Bloomberg Lecture Hall
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...
Apr
01
2016

High Energy Theory Seminar

Cross-Order Relations from Maximal Unitarity
David Kosower
1:45pm|Bloomberg Lecture Hall
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...
Mar
18
2016

High Energy Theory Seminar

2d (0,2) Gauge Theories and Calabi-Yau 4-fold Singularities
Sangmin Lee
1:45pm|Bloomberg Lecture Hall
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...
Mar
04
2016

High Energy Theory Seminar

B-brane transport on (non-) abelian gauged linear sigma models
Mauricio Romo
1:45pm|Bloomberg Lecture Hall

I will define the hemisphere partition function for B-brane boundary conditions in GLSMs and describe some applications to B-brane transport on spacial classes of (non-) abelian GLSMs.

Feb
19
2016

High Energy Theory Seminar

Multiloop Scattering Amplitudes in String and Field Theory
Carlos Mafra
1:45pm|Bloomberg Lecture Hall
I will review recent progress in the computation of multiloop scattering amplitudes using the pure spinor formalism of the superstring and make comments about future directions.
Feb
05
2016

High Energy Theory Seminar

Tree and One-Loop Amplitudes from Scattering Equations
Ellis Ye Yuan
1:45pm|Bloomberg Lecture Hall
Scattering equations are useful in organizing perturbative S-matrix of massless particles. Based on these equations tree-level amplitudes admit a compact expression in theories such as pure Yang-Mills, gravity, etc, where properties such as...
Jan
22
2016

High Energy Theory Seminar

Possibilities for the 750 GeV Excess
Matthew Low
1:45pm|Bloomberg Lecture Hall

In the 13 TeV LHC data both experiments have observed an excess of events in searches for new particles that decay to pairs of photons. Although the data is still inconclusive, this could be the first direct sign of new physics beyond the Standard...

Dec
04
2015

High Energy Theory Seminar

Bulk Energy Conditions from Relative Entropy and Comments on Bulk Reconstruction
Jennifer Lin
1:45pm|Bloomberg Lecture Hall
I will present results on how positivity properties of relative entropy in holographic CFT's give rise to energy conditions in asymptotically AdS spacetimes. This part will be a sequel to Nima Lashkari’s talk on 11/2. I will also comment on the...
Nov
20
2015

High Energy Theory Seminar

Entanglement, Spacetime, and Quantum Error Correction
Xi Dong
1:45pm|Bloomberg Lecture Hall

Over the last few years it has become clear that there is a deep connection between quantum entanglement and gravity. I will talk about two aspects of this connection. The first involves understanding quantum entanglement from a holographic...

Oct
23
2015

High Energy Theory Seminar

A Perfect Bounce
Neil Turok
1:45pm|Bloomberg Lecture Hall

We study the quantum cosmology of a universe with conformal matter. For homogeneous, isotropic metrics and matter, the quantum gravitational path integral may be performed exactly. The result is a "perfect bounce," in which the universe passes...

Physics