As research into quantum gravity continues, it is wise to look at the mathematical issues at hand. Most would agree that ordinary algebraic geometry is not sufficient to tackle the problem in its ultimate form. The theory of motives, at least in its commutative form, is only recently finding applications in the study of scattering amplitudes and Calabi-Yau compactifications. Noncommutative algebraic geometry and its generalized motives, as an extension of Grothendieck's dream of building a gateway between algebraic geometry and the assortment of Weil cohomology theories (de Rham, Betti, l-adic, crystalline, etc.) seems to be a more appropriate tool in the study of quantum geometry. In the noncommutative framework, the role of algebraic varieties and classical Weil cohomologies is played by differential graded categories and numerous functorial invariants. The gateway category

**Mot**, through which all invariants factor uniquely, is the category of noncommutative motives and the different invariants (the Grothendieck, higher K-theory, and cyclic homology groups, etc.) are simply different representations of the motivic category.

## 3 comments:

Just so you know, the two links in your entry point to the same URL. I assume that wasn't intended.

Im really interested in the topic, even though I only understand a rough sketch. If you know of any good reviews or introductions to the math from the perspective of stringy physics, that would be very much appreciated (I of course know the basics of algebraic geometry, cohomology, etc..) Thanks.

-Cliff

Hi Cliff

I fixed the second link. A more recent paper by the same author is arXiv:1204.6468. Some other nice papers are here and here.

The research was precise that before. We have now a clearer view.

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