Introduction to Shape Dynamics

11 04/2016

Monday, 11 Apr. 2016, 11:00 - 12:30

Workgroup Brukner Group

Presenter: Tim Koslowski
Host: Philipp Höhn
Where: IQOQI Seminar Room, 2nd Floor, Boltzmanngasse 3, 1090 Vienna

I will motivate that the universe as a whole needs to be described differently than its subsystems:
All that can be objectively predicted about the universe as a whole are relations of physical quantities
within. This can be formalized by the requirement that the universe should be a dynamical system that describes an unparametrized curve on the space of relational configurations (shape space).
This leads to the so-called "shape dynamics" description, which can be shown to be locally indistinguishable from General Relativity.
For pedagogical purposes I will provide a toy model for this shape dynamics description of a Newtonian universe and outline the conceptual steps that one has to do to recover the standard description of Newtonian physics for subsystems of this shape dynamical universe. I conclude with remarking that the analogous steps can be taken for the shape dynamics description of General Relativity and quantum cosmology as well.