http://blog.stephenwolfram.com/2016/02/black-hole-tech/

EINSTEIN LECTURE SERIES

Warp drive

Astronomy

Gravity waves observed! : Observation of Gravitational Waves from a Binary Black Hole Merger

Notes from David Wallace's talk

Standard approach at theories:

Start with manifold and geometric objects

There are some absolute objects, and dynamical objects.

Spacetime symmetry group leaves absolute objects invariant. In GR, no absolute objects, so full diffeomorfism groups.

Einstein field equations

Alternative: G-structured space

Kleinian geometry: substractive construction.

vs Riemann geometry: additive construction

Check video of David wallace seminar 11/feb/2016