Category: Science

Visions of Future Physics

At a recent dinner, joined by a small coterie of postdocs, Arkani-Hamed drew a pentagram on a napkin. The pentagram, like the amplituhedron, is defined by a finite set of lines crossing at a finite number of points. Arkani-Hamed darkened nine points in the configuration and explained that the first eight of these dots can be placed on a grid. But no matter how fine the grid, the ninth dot always falls between grid points; it is forced to correspond to an irrational number. There is a mathematical proof, Arkani-Hamed observed, that all algebraic numbers can be derived from configurations of a finite whole number of intersecting points and lines. And with that, he expressed a final conjecture, at the end of a long, cerebral day, before everyone else went home to bed and Arkani-Hamed headed to the airport: Everything — irrational numbers, along with particle interactions and the correlations between stars — ultimately arises from possible combinatorial arrangements of whole numbers: 1, 2, 3 and so on. They exist, he said, and so must everything else.

Credit : Béatrice de Géa

→ Quanta Magazine

Black Box Trading : Why They All “Blow-Up”

While in Greenwich Ct. one afternoon I will never forget a conversation I had with a leading quantitative portfolio manager. He said to me that despite its obvious attributes “Black Box” trading was very tricky. The algorithms may work for a while [even a very long while] and then, inexplicably, they’ll just completely “BLOW-UP”. To him the most important component to quantitative trading was not the creation of a good model. To him, amazingly, that was a challenge but not especially difficult. The real challenge, for him, was to “sniff out” the degrading model prior to its inevitable “BLOW-UP”. And I quote his humble, resolute observation “because, you know, eventually they ALL blow-up“…as most did in August 2007.

→ Global Slant

Psyching Out Borrowers

Follow-up on yesterday’s article about personality tests approval to get loans. Payoff adds a touch of algorithms on top of psychology to determine the creditworthness of the borrower.

Galen helped develop the matching algorithms at eHarmony, which are responsible for 4 percent of U.S. marriages. We’re using his expertise to bring psychology to finance. Our science is ultimately about behavior change and helping people make better financial decisions. This process of change begins with self-understanding, and we’re using advanced psychometric assessments to understand people’s mindsets— the goal being to improve how they approach their financial decisions. We’ve taken the hundreds of questions you might answer in a typical psychometric assessment and compressed them into a three-minute “gamified” online assessment that gauges your financial personality.

→ Bloomberg

After Prime Proof, an Unlikely Star Rises

Follow-up on one of my favorite article from the first half of 2015 with this brilliant documentary on Yitang Zhang :

“Never heard of him. Absolutely never heard of him,” said Andrew Granville, a number theorist at the University of Montreal, in Counting From Infinity. When Granville heard about the result and the techniques that Zhang used, he recalled saying, “There’s no way that somebody I’ve never heard of has done this.”

https://www.youtube.com/watch?v=XIIyKWxGhEA

→ Quanta Magazine

Robots On Wall Street ?

As automation in financial services grows, computers and algorithms have taken on some of the traditional work of traders, clerks and financial advisers. Now, a host of startups that use artificial intelligence to write news stories and other reports have set their sights on writing work at banks and financial-service companies.

→ The Wall Street Journal