Perturbative Topological B-model String Theory In Twistor Space

The ever-so-positive Grassmannian

From an October 2017 homepage:

Nima Arkani-Hamed1 of the Institute for Advanced Studies in Princeton, with a sweeping naturalness, proclaims “Spacetime is doomed2 (go to 5:45 minutes of 1.22.44). Pacing throughout3, his really-real reality is within his ever-so-illusive amplituhedron4 with a string to a planar N.5 He declares that it’s equal to the perturbative topological B-model string theory in twistor space6 (an ever-so-positive Grassmannian7) (related ArXiv article).

To which I reply, “Yes, of course. We knew that.”


1 The first link goes to our correspondence (mostly emails) to Nima Arkani-Hamed. He has also received a few tweets as well.

2 Spacetime is doomed is a YouTube video. If you go to 5:45 minutes of his 1 hour 22 minute lecture, you will hear that indeed, spacetime is doomed. The entire lecture is his focus on this concept.

3 Pace-Man is our affectionate name for Nima, from his pacing back and forth when he gives a lecture.

4 The amplituhedron has a special place within our work. It was one of many basic structures (which by no means is the most basic). It seems simple is better so the transformations between circles and spheres (ccp) to lines and tetrahedra-then octahedra probably are.

Three tetrahedrons-one octahedron

We knew that!”

5  The N=4 supersymmetric Yang–Mills theory within Wikipedia is entirely readable, but not easily understood.

6 Twistor space. We’ll be back. Twistor space can be explained in light of the 202 notations.

7 Grassmannian. I’ll be back. You’re going to love the Grassmannian that we describe! We will start with this image on the right. -BEC

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