Physics

I will discuss the status of the controversial "entropy bounds" proposed by Bekenstein and Bousso, as well as the reinterpretation of these bounds by Casini and others which made them actually true in QFT.

Old View:

* Wall, arXiv:0901.3865 [review...

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...

Assuming the diphoton excess at 750 GeV is real (a big assumption!), we will have a discussion of various theoretical possibilities for what the underlying physics might be. Some refs are 1512.04933, 1512.07904, 1512.07733

In previous work it has been observed that the singularity structure of multi-loop scattering amplitudes in planar N=4 super-Yang-Mills theory is evidently dictated by cluster algebras. In my talk I will discuss the interplay between this...

Assuming the diphoton excess at 750 GeV is real (a big assumption!), we will have a discussion of various theoretical possibilities for what the underlying physics might be. Some refs are 1512.04933, 1512.07904, 1512.07733

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...

We would like to discuss about soft gravitons. On the one hand, they enter in the soft theorems of gravity scattering which exhibit universal structures useful in the S-matrix program (e.g., 1404.4091, 1406.6987). On the other hand, they appear in...

The pure spinor formalism is an alternative description of the superstring which is manifestly spacetime supersymmetric and can be covariantly quantized. As a consequence, in recent years many superstring amplitudes which were impractical to...

Scattering amplitudes, in a wide variety of gauge theories, and independent of dimension and gauge group, have surprising kinematic structure which is currently only understood in terms of graphical rules relating the kinematic weights of graphs, in...

Motivated by black hole physics and holography, we study chaos, scrambling, and complexity by considering the entanglement properties of unitary operators. First, we develop a diagnostic of chaos by directly considering the time evolution of a...