Dynamics of Pure Shape, Relativity and the Problem of Time

Details Dynamics of Pure Shape, Relativity and the Problem of Time Dynamics of Pure Shape, Relativity and the Problem of Time

2003-09-18

arxiv.org/abs/gr-qc/0309089v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages. To appear in Decoherence and Entropy in Complex Systems (Proceedings of the Conference DICE, Piombino 2002, ed. H. -

Scientific paper

A new approach to the dynamics of the universe based on work by O Murchadha, Foster, Anderson and the author is presented. The only kinematics presupposed is the spatial geometry needed to define configuration spaces in purely relational terms. A new formulation of the relativity principle based on Poincare's analysis of the problem of absolute and relative motion (Mach's principle) is given. The enire dynamics is based on shape and nothing else. It leads to much stronger predictions than standard Newtonian theory. For the dynamics of Riemannian 3-geometries on which matter fields also evolve, implementation of the new relativity principle establishes unexpected links between special relativity, general relativity and the gauge principle. They all emerge together as a self-consistent complex from a unified and completely relational approach to dynamics. A connection between time and scale invariance is established. In particular, the representation of general relativity as evolution of the shape of space leads to unique definition of simultaneity. This opens up the prospect of a solution of the problem of time in quantum gravity on the basis of a fundamental dynamical principle.

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