It is of great physical interest to construct a canonical quantization of asymptotically flat spacetimes. The classical phase space variables are subject to delicate boundary conditions at spatial infinity and the first challenge is to construct a quantum kinematics which carries an imprint of these boundary conditions. 456 more words

## Tags » Loop Quantum Gravity

#### Semiclassical states in quantum gravity: Curvature associated to a Voronoi graph by Daz-Polo and Garay

This week I’ returning to a much more fundamental level and reviewing a paper on Voronoi graphs. These are a method of dividing up a space into triangles and my very early work on this blog was looking at random triangulations. 1,547 more words

#### Curvature operator and gravity coupled to a scalar field: the physical Hamiltonian operator by Alesci, Assanioussi and Lewandowski

This week I been reviewing some conference proceedings the FFP14 Conference, Marseilles 2014. One paper I particularly like is this one by Alesci, Assanioussi and Lewandowski. 530 more words

#### The Spinfoam Framework for Quantum Gravity by Livine

This post looks at the part of Livine’s great PhD thesis about the quantum tetrahedron.

Below is a table from this thesis looking at the types of structures found in… 440 more words

#### Science Is Not About Certainty

### The separation of science and the humanities is relatively new—and detrimental to both

By **Carlo Rovelli**. *Excerpted from The Universe: Leading Scientists Explore the Origin, Mysteries, and Future of the Cosmos. * 525 more words